When Seth and Reba are coming out of the Gallery at the 1:06 mark, Seth tells Reba the boys are enjoying fighting with their angel swords. But this is before Mrs. Merkle even tells the boys about their swords, which is at the 1:40 mark.
In the angel sword fight,the dancing angels in the background go from barefooted to socks and shoes and then back to barefooted.
In the travel agents the tree that is on the counter has a red light at the top from one side, and not from the other. Many times the lights come and go.
The original teacher supervising the play steps to the edge of the stage, then is seen stepping to the edge again, before falling off the edge.