The red dress that the maid shows Katey is different from the one that she wore to the country club.
After the Christmas Eve dance at the Palace, when Katey enters the hotel suite, she places her black shawl down on the table and walks away from it, yet it is in her hand when her mother slaps her during their argument.
When Javier is getting ready to go to the dance-off, he puts on his brother's suit coat twice.
When Javier leaves Katey on the beach after walking her home from La Rosa Negra, he puts his jacket over his arm twice in subsequent shots.
When Mrs. Miller is talking to Katey about her relationship with James, Katey's sleeve changes from on her shoulder to off and back.
The family moves to Cuba because the father got a promotion from Ford, but the car that transports them to the hotel at the beginning of he movie is a Chrysler.
You can clearly see that Katey's dress strap is torn even before James tears it.
When Susi and the other girl are in the tent, it looks like January Jones' character is that other girl. They call her Lois, but her character name is Eve. It's dark in the tent, so it could be another blond girl, but it looked like January Jones.