Continuity mistake: When Meryl Streep "blasts" Goldie Hawn with the shotgun and Goldie falls into the pool of water, she falls in backwards. However, when we see her get up, she is getting up from a face-down position. (01:05:25 - 01:07:10)
Continuity mistake: When Madeline is given the card with address of Lisle Von Rhoman on it, she tears it down the middle into two, and the two pieces she tears are torn neatly and straight down the middle. Yet later, when Madeline takes the two pieces of the card from her bag, they are torn much differently, and aren't torn straight and neatly. (00:19:45 - 00:28:20)
Answer: Actually, they're both wearing coloured contacts. If you look at timestamp 01:17:23 when they say "Pleeeaase" to Ernest, you can see they're both wearing contacts. Meryl's aren't as noticeable, but they are the bluish-purple/periwinkle colour Ernest was using when he was painting her touch-ups on the pool table.