Hello! I am currently working on a feature film, which plays for the most part in an Oltimer workshop. And would need help from experienced hobbyists / mechanics There should be a scene in which someone rather inexperienced (but also not completely unsuspecting) should assemble and install a car engine, but at the same time commits a serious mistake – which nobody first notices. Something that can cause real problems later on, so for example, the whole engine will be scrapped if you start the car or there is a risk of an accident. What are the classic mistakes in assembling? Or maybe even someone has experienced something like that? As said: It shouldn’t be a really stupid mistake, but something that can happen if you don’t know enough … The car brand doesn’t matter – the main thing is a (young) oldtimer. Thank you!!!