This was a nice surprise to find when I logged in today. It’s nice seeing one of your videos again.
You weren’t hallucinating when you saw a ghost. There are two special bus passengers who can appear randomly.
99% of players will never see them.
You can find info about the secret passengers here:
https://retroachievements.org/game/18825
I would NOT recommend trying to find them as many people have made themselves miserable searching for glitter.