Vampire Through the Years

While most people have or have access to 1st edition Werewolf - Changeling books, it seems (correct me if I'm wrong) as if most don't have the 1st edition of Vampire; fortunately for you, I do, so here're the changes White Wolf's made over the years. Enjoy!
Discipline changes to the Players Guide are at the bottom of the page.

Changes to Experience Point costs.

Vampire
The Masquerade

Animalism

Level 1 went from Intelligence + Animal Ken to Manipulation + Animal Ken. You were also unable to implant suggestions in the animal, and the roll determined the amount of communication possible -- 1 success meant you understood the animal's basic motives, while 5 allowed full communication and no deception on the animal's part.
Level 2 went from Charm + Survival (that looks like a typo, tho) to Charisma + Survival. The only other change was in the table; first ed. included range (maximum 10 miles).
Level 3 is completely different; it used to allow you to issue complex commands to animals. Once again, there was a table that determined the lengths to which said animal would go to for you (on a Manipulation + Empathy roll).
Level 4 is the same, except that it used to be Wits + Empathy and the roll determined the amount of time you could control the animal. You could not use any Disciplines, either.
Level 5 is the same, except that the table went further (to 5 successes). The only other change is that a high Humanity (target) rating made it more difficult to transfer the Beast.

Auspex

Level 1 remained the same, except that for mundane circumstances, Auspex doubled your Perception rating.
Level 2 had the success table change a bit (1 - primary colors, 2 - precise shade, 3 - subtleties + Demeanor, 4 - changes in colors, 5 - color at base of the aura and true Nature).
Level 3 remained the same, except that it had a table for successes.
Level 4 remained unchanged.
Level 5 was essentially the same (the wording changed a bit).

Celerity

1st edition - Spend as much Blood as you have Celerity, and it stays active for the whole scene! Your Generation mattered, however, as a 13th Gen could only activate one point at a time, which meant that someone with Celerity 3 would take that many turns (10th Gen or higher) to get really quick. Furthermore, Celerity also added to your Dexterity rolls and the book mentions that vampires could exceed 10 points in Dexterity + Celerity if they were over 100 years old.
2nd edition - Spend one point and you activate as much Celerity as you want/have, but it only lasts one turn.
Dark Ages - Spend as much Blood as you have Celerity, but it only lasts one turn.

Dominate

Level 1's only change is that there was no roll needed.
Level 2 also remained unchanged, except that there was a success table.
Level 3 is also essentially the same (the table's wording was different).
Level 4 also remains unchanged, except for wording.
Level 5 is the same, except that botching did not render the victim immune to Dominate.

Fortitude

The only difference is a mention of attaining a Stamina + Fortitude rating of more than 10 only after living more than 100 years.

Obfuscate

Level 1 remained the same, save that 2nd edition went into more rich detail and included children's ability to blow through the Discipline.
Level 2 was what level 4 is now -- Vanish.
Level 3 remained basically the same; the table was slightly altered, with 1st edition including continuous alterations without extra rolls at five successes.
Level 4 was what level 2 is now -- Unseen Presence.
Level 5 remained unchanged.

Potence

Potence did not add automatic successes to anything more than simple strength feats. Again, as with Celerity and Fortitude, there is mention that a combined Strength + Potence rating could exceed 10 if the vampire was over a century old.

Presence

Level 1 was what level 2 is now.
Level 2 was what level 3 is now.
Level 3 was, partially, what level 1 is now -- everybody is attracted to the vampire.
Level 4 remained the same, but the table changed. 1st edition limited the range (5 successes to summon someone from anywhere in the world).
Level 5 remained unchanged.

Protean

This Discipline remained unchanged save for Wolf Claws, which did not need a Blood Point to activate. The other transformations only required one turn, instead of three, to perform.

Thaumaturgy

The levels remained unchanged for this Discipline, but, as with Dark Ages, the path "A Taste of Blood" had to be bought separately.
While on the topic of Paths, A Taste of Blood did change somewhat:

Level 1 is the same.
Level 2 allowed an extra Blood Point to be spent per turn (diff. 7).
Level 3 is the same.
Level 4 allowed the creation of extra blood within the Vampire (provided there was at least one point already there). You got one extra point per success at difficulty 6 (you needed to drink afterwards in order to use the power again).
Level 5 is the same.

The Vampire
Players Guide

Chimerstry

This power remained exactly the same, except that second edition clarified it somewhat. 1st ed.'s description of the Discipline, particularly Horrid Reality, was confusing.

Melpominee

Necromancy

This power, like Chimerstry, remained basically unchanged. Even the tables are the same.

Obeah

This power also remained unchanged.

Quietus

This power remained the same.

Serpentis

Once again, the power was not changed.

Thanatosis

The Samedi were added to 2nd ed. Vampire -- Thanatosis did not exist.

Experience Point Costs

Type of Trait	Cost
New Ability	3
New Discipline	7
Willpower	current rating
Virtue	current rating
Ability	current rating x 2
Clan Discipline	current rating x 3
Attribute	current rating x 4
Other Discipline	current rating x 5

Caitiff had to pay 4x level for their Disciplines.