Corrected entry: In addition to Finney not being seen cutting the phone's cord (and not having anything to cut it with), the part of the cord that he held was longer than would be expected (even giving allowance for stretching). Also, the phone line that was attached to the wall phone was black before it returned to off-white. (01:27:00)
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The Black Phone (2021)
1 corrected entry
Continuity mistake: Spoiler Alert: When Finney digs the hole through the wall with the toilet tank cover, he creates a relatively round hole to the back of the refrigerator. After climbing into the hole and then back out, the hole is now almost perfectly square. (01:16:38 - 01:17:28)
Suggested correction: I agree that the appearance of the hole changes, but I wouldn't say it went from "relatively round" to "almost perfectly square." (The appearance is probably due to the camera's angle). The hole started out as oval-like but progressed to a rectangular shape with curved corners. When Finney came back, the rectangular shape had squarer corners and straighter/neater edges. [The wording should be changed for accuracy, but I won't edit your wording.].
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Correction: We do see Finney cutting the phone cord; as soon as he hangs up with Robin he uses his toy rocket ship to strip and rip the cord. Also, throughout the film the spiral phone cord is always several feet long (even when not stretched), and we see him rip it about halfway down, so later it is not longer than would be expected.
Aerinah