Continuity mistake: Jimmy Stewart has two ice cream sundaes in his hands, and both have a dark topping (likely chocolate) as he is talking to the character Brandon. The shot changes and the toppings change to one dark and one butterscotch (light topping).
Suggested correction: The ice cream toppings do not change. The chocolate has simply melted down the side of the ice cream, thereby appearing lighter.
Other mistake: Brandon is wearing gloves but Phillip is not when they kill David. Afterwards, Brandon removes gloves from Phillip's hands.