When JD is singled out by Dr. Kelso at the conference, a backpack in a row of seats behind him disappears and reappears between shots.
While JD and Eliot are discussing what to do with Eliot's patient, the sign in the background advertises a bowling league and the word "league" is spelled incorrectly to show "leauge."
When JD and Eliot are standing on the bridge getting ready to bungee jump you can see a black safety strap is running from JD's waist to a safety bar on the ground.