Plot holes happen. In movies, books and games we see them everywhere and while some can easily be ignored some just leave you scratching your head.
One thing for sure is Five Nights at Freddy's isn't a a game without plot. It has a definite story but it just falls short in the complete telling.
Hopefully, I didn't ruin the game for you too much. So now it is your turn; what are some plot issues you've noticed in the game?