Editing Issues

When editing our first scene we discovered that we had a problem. The first time we shot the scene of walking across the car park, Charlotte and Kirsten were eating crisps. We shot them eating crisps three times. We later went to shoot the continuation of this scene and neither Charlotte or Kirsten were eating crisps. When editing we discovered that as the 2 scenes flow continuously, in half the shot we are eating, in the other half the crisps have disappeared. Unless we can find a way with editing to make it not look like it changes, we will be having to re-shoot one of these clips.