About 25 minutes into the film, Laird Cregar ducks behind a couple bushes as he runs across a lawn. They are obviously props, because they rock back and forth as he grabs onto them.
When John slides his roulette chips across the table to cash them in, other people's bets are corralled with them, yet no one complains.
When they get to the roulette table, Gene Tierney says that 15 is a lucky number. After the spin the croupier announces 18 red and Tierney exclaims they've won.