In some levels, on or two objects scrolling in the background get corrupted when reaching the left side of the screen. I only noticed that in 3 or 4 polar levels.
Example : E8T6A, level 47
in attachment, the little house at the left starts being corrupted
screenshot
I forgot to mention : it's the US english version of the game
These glitches have been fixed in ScummVM GiT, and were caused by room 6 script 255 never been resumed in the HE98 version of the game.