- In one scene, when Hugh Grant is dancing in 10 Downing Street, he accidentally falls over a chair.
- When the Prime Minister is practicing his dance routine, he accidentally knocks over a lamp but quickly jumps back up and ignores it.
- In the scene where Colin Firth and Lúcia Moniz are having their intimate first encounter in Portuguese, Firth accidentally laughs before they fully connect.
- When Mark comes home to find his wife at the door with roses after their separation, he was supposed to open the door and immediately break into tears. He did cry, but it took longer for the tears to come so the assistant director off-screen held up a sign indicating that he should do it as soon as he opened the door.
- When Harry comes to visit Sarah at her house and the two of them decide to go and dance, Alan Rickman accidentally misses the handrail by a few inches when going up the stairs.