When the class is discussing the awards, Farkle's desk is completely empty. The speaker only shows up when Riley and Maya do their 'handshake' and when Cory notices after announcing Farkle's award.
When Billy and Farkle are doing the "awesome" handshake, Maya's forehead is completely clear of marker, but when Lucas walks up and talks to Cory (Mr. Matthews), you can see smudges of the marker on Maya's forehead.
When Riley grabs farkle she only has one hand on his collar but then when it cuts to farkle both hands are holding his collar and you never see her other hand move.