During the last scene in the bar, Claudia is sitting at a table with a crutch clearly visible behind her, a prop to coincide with her injured ankle during the chase/fight scene with "Bluto". Yet, when Artie & the stage announcer name the surprise guest (Cherie Currie), Claudia jumps up, runs to Artie with NO LIMP , hugs him and then, when invited to the stage, she runs to the stage with no visible impairment.
The initials on the inmate's shirts is AK.S.P. which apparently stands for Arkansas State Prison. AK is the two letter abbreviation for Alaska. AR stands for Arkansas.
The description of Beethoven's clock on Artie's computer shows the word "Christmas" misspelled as "chirstmas."