Continuity mistake: When Fran's in the kitchen making an ice cream sundae she tops it with a lot of whip cream, but after Fran pulls a tissue out of Gracie's shirt, when she and Maxwell sit down all of the whip cream suddenly vanishes, but then it reappears.
Character mistake: The Sheffields are going to Miami but when they are there, Maxwell mentions having gone to Disney World on the same trip. Disney World is not in Miami, it's in Orlando.
Answer: Children's brains and language skills are still developing at that age and they adapt to the environment they live in. My former boss was born in England and moved to the US at about eight years old. She completely lost her British accent by her teens, even though her parents still spoke as typical English citizens. A Japanese co-worker and his wife, also Japanese, spoke English as their second language. Their two children learned both English and Japanese simultaneously while growing up and spoke each language with the appropriate accent.
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