[The Fifth Horseman]

There are a few in Bloodrayne 1 that I managed to catalogue, three of which are somewhat interesting.

First, "Spider Queen decapitation", which actually is more of a consequence of boss design then actual glitch. See, when fighting the first boss you have to cut off its legs... but, as the boss can be mutilated, you can try shooting it up with shotgun - sometimes you can take its head off that way.
Neat glitch, really. Makes the fight much shorter...

Second, the "teachers and traitors 30 second glitch". It requires some fancy reflexes to execute, but if done correct - you pass the level in about 30 seconds and skip one of the more annoying boss fights.
Well, it's fun.

Last glitch is pure EVIL. When fighting the final boss, it is possible to push him through a glitched wall and thus be unable to finish the game (been there, done that).