When Jack finishes his fight with Rip he is only slightly bloody and wet. When he comes through the door to the basement only seconds later, he is drenched in a much redder, and thicker blood.
Hair lengths change throughout the picture (although this is a half intentional nod to Army of Darkness).
Rip's sunglasses are Elvis glasses when he dies, but upon his return as a zombie, they are aviator glasses.