Audio problem: It is well-established that the symbiote can communicate with Eddie telepathically and others do not hear it. However, it can also speak normally and does so plenty of times; when the two are arguing in the bathroom of the prison, we see that Venom opens its mouth and move its 'lips', which would mean the woman in the stall and Detective Mulligan can hear him - which makes no sense in the scene. (00:06:30)
Audio problem: Eddie Brock is trying to find where Carnage might be headed. To draw inspiration he listens to the recording of the last time they spoke (when incidentally he was never seen retrieving the tape). However, the lines in the recording are different takes from the original scene, spoken at a brisker pace without dramatic acting pauses. (00:38:00 - 00:42:40)