What strange glitches have you experienced with the game?

well the only one I can think of isnt really a glitch that much, just in RCT3 when using the custom support killer from the Raflvieh pack, it randomly turns off and on underground view for me

ATH's Catwalk Set is invisible, and many of the more popular sets cause the game to instantly quit after clicking on the scenery tab. This may be a result of only being able to use vanilla RCT3 rather than expansion pack content.