Synchronic (2019)

Plot hole: So when he travels through time whatever he has on him or with him or whatever he's holding goes back in time with him just like his dog or the wood. Now he's sitting on the rock drinking a beer and his friend is talking to him and all that's heard and seen is his beer bottle breaking on the rock when he disappears through time. Makes no sense for it to fall from his hand and break if he's in possession of it. The beer should've gone with him. (01:26:30 - 01:27:30)

Revealing mistake: The fire Steve made when he "traveled in time" back to the Ice Age was obviously fake (computer-generated). The logs were arranged like a teepee and the "fire" was contained to the inner sides - flames did not spread toward the outer edges. Moreover, the fire was built on top of snow/ice but there was no melting under or around the fire.

KeyZOid

Continuity mistake: Packets of Synchronic were placed on top of the garbage already in the can and were inconsistent from one shot to another. Also, the amount of crumbled papers under the Synchronic decreased. (It is also interesting that no new garbage was placed in the can on top of the Synchronic packets even though over one day had passed).

KeyZOid

Steve: This is delicious. This dirty shitty river, this beer, this time. Wouldn't change it. The clock just... keeps tickin' down, and the lower that number gets, you realise how fucking amazing now is. The present is a miracle, bruh.

Steve: You know the difference between your life and mine? Do you wanna know what the difference really is?
Dennis: What?
Steve: Random events, chance, and luck. Now, some people might think it's God, or the universe, or what the fuck ever, but that's what it is.

Dr. Kermani: Only one more sample to get rid of.