I'm pretty sure I read in an interview somewhere with Frank Oz that there was a part cut from the final version of MTM that involved a family of little people also staying in the lockers.... he felt bad about it because apparently the actors showed up at the movie premiere and nobody had told them their scenes were cut - Frank said he now on movies he directs he makes sure that folks know beforehand if their scenes are cut so they don't have to find out at the premiere! I wish I could remember where I read that so I could back up this statement with evidence... but that's my understanding of the reason there's a dude in the locker!