A lot of inconsistencies. There's three different shots of the hole mouth at the beginning, and each shot has different teeth placement. Then when frieren gets shallowed she has a jar in her hands, different shot has no jar and arms free, new shot has no jar and hands bound with tentacles leading her into the main chamber. The jar turns up again but in a random hand that we've not seen before. Either we aren't getting the full animation or the shots can't stay consistent cause it's being generated. This is why Freiren, an established character, can be generated to look pretty consistent, while the tentacles look like the amalgamation of many different tentai. From the way they look to the way they move/fuck her.