Studio Interference: two words that strike more dread in film fans than extensive re-shoots, another reboot and CGI Moustache. Being a director is a hard enough job as it is; they have to balance budgetary constraints, prevent continuity errors and make sure everyone on set knows what they're doing, amongst many other responsibilities. The last thing they need is someone else forcing them to mess it around, often at the last minute.
Granted, sometimes it is completely justified, and makes the film all the better for it. Take Alien and Get Out for example, which both saw their final moments changed, preventing their much bleaker original endings and allowing them to become the great achievements they are today.
Sadly though, these moments are few and far between. Yes, film is a collaborative medium, but way too many times we see instances where directors are inundated with ridiculous demands, sometimes not even originating from the studio itself! While trying their best to check all the boxes, some mandates are so terrible that even the best in the business aren't able to weave them into their films in satisfying ways. Inevitably sticking out like a sore thumb, us film fans can see right through this. These are the worst offenders.