blooper reel       
noun [ C ] uk/ˈbluː.pə ˌriːl/ us/ˈbluː.pɚ ˌriːl/ (also bloopers reel)
 (电影末尾的)拍摄花絮
a film consisting of a series of bloopers (= funny mistakes), shown, for example, at the end of the film or programme that the mistakes come from
  The blooper reel shows the actress forgetting her own character's name.  拍摄花絮中有女演员忘记自己角色名字的片段。 
 - More examples
 - Box sets eliminate commercials and add extra features like blooper reels and star interviews.
 - Half the blooper reel on the DVD was her falling from wearing high heels.
 - The presenter is prone to stumbles and miscues, many of which are memorialized on blooper reels posted to YouTube.
 - Extensive extras include commentary with the star and director, deleted scenes, a blooper reel and more.