Continuity mistake: When Cillian Murphy's character is recording his message prior to entering the 'dead zone', our viewpoint is from within the monitor in front of him. As such, we see the on-screen image he sees, but reversed, floating between our vantage point and his image. At the bottom of the screen are touch-screen function 'buttons', again in reverse, which read (our left to right) 'RECORD', 'SEND', 'DELETE' and 'REVIEW'. But when our view changes to see the screen as we look over his shoulder from behind him, the visible buttons now read (right to left) 'SEND' and 'REVIEW' (he presses 'SEND'). They should be 'SEND' and 'RECORD'.
Factual error: The entire crew gathers to the viewing deck to watch Mercury traverse the Sun across their field of vision, which only takes several seconds. At the speed it's going, it would make a full orbit around the sun in less than an hour. Mercury's actual revolution period is about 88 Earth days, so from that distance you wouldn't see it move at all.
Capa: By the time you get this message, I'll be in the dead zone. It came a little sooner than we thought, but this means you won't be able to send a message back. So, I just wanted to let you know that I don't need the message because I know everything you wanna say. Just remember it takes eight minutes for light to travel from sun to Earth, which means you'll know we succeeded about eight minutes after we deliver the payload. All you have to is look out for a little extra brightness in the sky. So if you wake up one morning and it's a particularly beautiful day, you'll know we made it. Okay, I'm signing out and I'll see you in a couple years.