The board Al breaks with his head is obviously scored so it will break easily.
Tim shows a picture of a shed and says that its in Al's backyard. At this point he is living in an apartment, so most likely he has no shed.
Wilson begins reciting the state capitals in alphabetical order and continues over the closing credits. When he gets to the letter S, he gets the order wrong when he puts "Saint Paul" behind Salem, Salt Lake City, Santa Fe, and Springfield.