The positioning of the "Beware of Dogs" sign changes between scenes. On at least one occasion, the sign does not appear at all.
When the package is delivered, the mailbox suddenly appears - there was never a mailbox mounted on the fence until then.
The gate in the fence, when viewed from the outside is always oriented with the handle on the left and hinges on the right. When the package is delivered, the gate suddenly switches orientation (handle on the right and hinges on the left).