Inflight Sandwich
Ok, so maybe these are stretching it a little, but....
1) It looks like he took cling-film of his midflight sandwich - it wasn't invented until 1953 (I suppose it could be cellophane invented in 1900).
2) The sandwich looks like it is sliced bread rather than standard loaf, but sliced bread didn't come in till 1928, a year after the film is set. Or maybe they could just cut bread better than I can!