-Multiple gate keys bug (level hard lock) In the level "Taxing: Solve,solve like the wind!" there are 16 boxes with 4 keys in them at the beginning of the map. If you open the four boxes with the keys (keys are always in the same boxes), the green key you're supposed to get later in the top left part of the map will not spawn when you open that box. This means you cannot complete the level. The bug seems to stem from having 4 keys spawn in on the maps, which is the apparent maximum. Even if you pick up two of the keys, the 5th key still won't spawn in. Furthermore, restarting the level and then only opening two key containing boxes does not solve the issue, once the bug has been activated by opening 4 key boxes, you need to reload the map entirely to fix it. This also indicates there is some kind carry-over of information between level restarts, which if someone figures out how to exploit this it would mean a NG+ (new game+) category could be introduced to the individual levels category. If you figure out how to exploit this information carry-over let me know.

-Lemslip slippy OOB (Lemming hard locked OOB) The slippy road in the level "Lemslip" sometimes gets Lemmings stuck out of bounds. It can be avoided fairly consistenly, please see this video for an explanation:

-Balloon activated during movement animation. When moving up/down a ledge if you activate a balloon the game can sometimes crash and sometimes just make the lemming disappear/bug him out.

-Game crashes It has been observed that the game sometimes crashes when doing certain things. It appears to happen occasionally when using catapults in some levels. It has been observed when using the 7, 8, 9 and 0 keys to trigger balloons carried by Lemmings. None of these crashes has been reproduced/avoided with consistency yet so if anyone figures out what the trigger is just let me know so i can update the guide. *Update the balloon one may be related to specific animations of the lemmings.

RuffledBricks has observed that completing the final Mayhem level "Be careful who you shoot" and then afterwards attempting to complete the "All Is Not Lost.. yet.." level causes the game to consistently crash. It is unknown why and while it is a rather niché bug it suggests that if you've completed "Be careful who you shoot" you should close and restart Lemmings Paintball if you plan on speedrunning the all levels or taxing category afterwards.