When House is lying in bed, right before he looks at the clock and it says '12:31' the image has clearly been flipped, as can be seen by the bag lying on the right side of the bed instead of the left, and the doors and all the furniture on the opposite sides from all the scenes before and after the clip.
At 39:38 when Wilson talks to House from the urinal his rolled up sleeves change positions on his arms.
When Sgt. John Kelly's medical chart was shown the date of birth listed was 5/24/72, and the date of his last physical was 2/8/88, putting him at 15 at the time of his last physical. The minimum enlistment age for the US Marines is 17. Physicals are given at the time of enlistment, therefore his last physical should have been on or after 5/24/89.
Around 32:43 when the patient says "I can't feel my stomach" his mouth is not moving.
During the dream sequence, House says that urine is sterile. This is a popular misconception.
At the end if the episode, House opens to the closet door to dump the load of files in the "large" garbage can. Files with patient data can't be thrown in the trash as it's not secure. Files also must be retained for a number of years, so he shouldn't be tossing them in any manner.