When loading a world with no mods/addons at the top of the screen it says "[texture] [error] No Atlas Texture_side" four times. The errors are mostly non-fatal but somerhing just to clean up your code. But sometimes with addons they are real errors. The more addons the more errors. And without addons it only says [texture] [error] No Atlas Texture_side" four times. While Playing modded you can also come across errors like my cave mod said only mob that is a creeper mob can you swell mechanic whenever a mimic spawned. Resource packs are also causes of errors as my mib hp pack will give of like 10 of the smae errors at a time sayin (certain mob) unhandled variable error variable.hp when it shows me a new mobs hp. I also want to credit MC-93154 who has the same visual, not glitch but ability to see all fatal and non-fatal errors, seemingly only on servers though. All screenshots but one are modded worlds to show how many errors can appear.