When Eric arrives home from being sat barefoot on the rocks, his Father glances down and says "forget your shoes, did you?", implying he is still barefoot. However as he walks away, the sound of hard shoes can be clearly heard on the wooden floor.
During the "real date" scene, Rod goes in to buy cheese fries, and you can see through the car and can tell it's backed into the parking spot. However, when they are leaving, they back out of it.