Why not cut his throat while sleeping? That would end movie much earlier.

Why not move the freezer instead of trying open the door from inside?

They didn't show him climbing to window on carpet and come on, if he can't dig through the wall he can't dig few holes to climb up or move there toilet to climb to the window without bars? Why not use phone on the wire to swing it there to break glass and call for help?

Also hearing the line "he was idiot, but he was my idiot" copied word for word from House of Gucci released in same year is a bit cheap.

Whole movie was kinda meh, at best 6/10, no scary moments really, no twists.

edit: fixed phone autocorrect