Continuity mistake: In the episode where Katy, Carl and Todd go to see Badly Drawn Boy in concert, they go to the Rovers after the concert has finished. It's last orders so it must be 11pm. However, in the next scene in Martin's flat (when he is wondering where Katy has got to) the clock on his wall says 8 o'clock.
Continuity mistake: The night before Steve and Karen's wedding after Steve decides to let his mum invite Ken and Deidre, she walks out the front door, straight past the Barlows. Then, after they finish their dialogue about Tracy, she comes out of the toilet. I couldn't believe it when I saw it.
Continuity mistake: When Sarah Louise Platt was born it was January 28th, but in 2003, her birthday was celebrated (and was supposed to be) on Sunday 3rd February, the fourth show after her original birth date. Having Sarah's birthday six days after her 'original' birthday can't be compensated for even if the day she was born was wrong [because of broadcast date], as there are always at least 2 episodes every six days.
Continuity mistake: Episodes 6354 and 6355. When Sally Webster is frantically searching for her daughter Rosie, who is staying at the squat with Craig, between shots Sally's hair changes several times, but more obvious is that in some shots she has a very croaky throat, and in other shots she has no throat problem at all. These scenes were all supposed to be almost in real-time, and certainly in the course of one night.
Plot hole: Live 50th anniversary episode, aired December 9th 2010 - When Sally is allowed into the rubble to comfort Molly as the firemen attempt to free her, one of them says they'll get Sally a hard hat. But when we see her talking to Molly in the rubble, she has no hard hat on and instead one of the firemen is holding his hand above her head.