Milo cut the section of tape he needed because he never thought anyone would ever notice it. Milo locks the locker because he is in a hurry. He has to get out of the gym and home to establish his alibi. He is thinking like a man in a hurry, not like a man alone in an empty building. He should have put himself in his victim's shoes.
oh yes...gene stafford was definitely left-handed fred..we see that in that early scene.
i have always wondered how they (writers, director..etc..)goofed like that. the whole theory about the tying of the shoes goes right out the window...because we know he is left-handed. and wouldn't milo have known that? and he could have defended himself. (ok..i'm being picky-picky)
and joe! great comment about being in the victim's shoes!