When Ellen has only three days left, she gets the message while playing Scrabble with her friends: twice in a row, she pulls the letters "t-h-r-e-e-d-a-y-s" out of the bag, which are nine letters. The rules for Scrabble say you can only take a maximum of seven letters at once.
Though cars in the film have British license plates the steering wheels are on the left side.
When the "Skysleeper" lands in Fort Worth, Texas, mountains can be seen in the background. There are no mountains near Fort Worth.