I had multiple instances where checkpoints after dying resulted in placing me in geometry that didn't allow me to move or escape, meaning I had to quit out and restart the game from the menu, sound effects disappearing for weapons or enemies, warping textures/geometry, black boxes showing up in corners of the screen, and scripted events that never happened.
Plus a super weird physics glitch in an early level in what i think was a train depot? or bus depot? that caused a bus to start hovering in midair and spinning, and it was catching cell soldiers and sending them flying. It was pretty good.
I didn't have nearly as many glitches on Crysis 1 or 2, i feel like 3 is a much buggier game. kind of disappointing. Especially the texture/geometry warping glitch, I think it must have something to do with tesselation, in that last large open area where you're taking down AA guns it was really bad.