Sometimes parts of actors are not drawn correctly. In particular, right at the start of the game, in the first room, there is a fence on the left half of the room. If you walk to the leftmost point (a bit tricky, as this easily triggers a room switch), then if the actor faces in the right direction, parts of the fence are drawn *above* the actor. The attached screenshot exemplifies this.
Reproduced with latest SVN as of today (rev 25604).
Confirmed to not happen in the original.
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Originator: YES
Note: This is for the US version of MM NES.
Replicated with desc/1.3.0git-3499-gd054280 and Maniac Mansion (Europe) i.e. E variant.
The easiest way to replicate is with Wendy or Razor, returning from the mansion front door screen.
This happens with Dave as well on leaving the screen for a fraction of a second.
It looks like a vertical strip at the left of the screen clips the character drawing.
Screenshot attached.
Replicated Glitch...