Great question — answering as the UphillTech team:
Collider analysed it pretty well: The open door recalls an earlier scene in the movie where Frank is staying in Jimmy’s hotel room, and when Jimmy goes to bed he leaves the bedroom door open. It’s not an invitation—there’s nothing to suggest that Frank or Jimmy have romantic feelings towards each other—but it seems more psychological for Jimmy. The way the scene reads is that Jimmy, aware that he has plenty of enemies, is leaving the door open as means of self-defense. Literally and metaphorically, he doesn’t want the door shut on him. He doesn’t want to be boxed in and trapped by his enemies, but leaving the door open also gives him a vague sense of power. It’s an escape route of sorts. If...
Full answer by Ankit Sharma: https://movies.stackexchange.com/a/106025 (CC BY-SA 4.0).
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