 Ken Keeler , who wrote the lyrics for the " You 're Checkin ' In " musical number , spent two hours in a room alone to write the song . Upon sharing the lyrics with the rest of the production staff , some revisions were made , although little was changed . Bill Oakley was unsatisfied with the part of the musical where the actor claims , " Hey , that 's just my Aspirin ! " , claiming that a better line could have been written . 
