The bathroom door opens inward in some scenes, and outward in others.
When Bugs deducted 35 shillings for Sam's quick "Ooo", it can be assumed he was trying to deduct a fraction of a pound. In this case, Bugs would be wrong, as, during this era, England was still on the "Lsd" monetary system, where the division of a pound was 20 shillings or 240 pence (there were 12 pence to a Shilling). Since Bugs deducted 400 Pounds and 35 Shillings, he more appropriately should've deducted 401 Pounds and 15 Shillings.
When Bugs is playing Brahms' Lullaby near Sam's room, we hear him singing to the music, but his mouth isn't moving.