When DI Poole sits in the sun to test the sunscreen, he is actually sitting in the shade. This happens again when he tests the newly discovered sunscreen.
The scarf is correctly referred to as "zebra print," however, some viewers, possibly unfamiliar with the British pronunciation of "zebra," hear "leopard print."
At the start of the episode when the wheelchair is tipped over there is a closeup of the wheel spinning. The audio during the closeup is from a bicycle wheel spinning as there is a clicking noise from a freewheel gear.