Trying to raise the police, Jim throws something through a window with foil alarm tape. The alarm goes off even though the tape hasn't been broken.
While walking out of the hotel after attending the 2nd auction you can clearly see the front entrance of the hotel. After delivering the bird to the William Daniels character. He gets in his car and starts to leave. After deciding to make a phone call. He backs up to a pay phone that was not there in the previous shot.
In the opening scene, Barrows, an Englishman buying a ticket from the English airline agent at London Heathrow Airport asks for a "round trip" ticket. Obviously the scene wasn't really shot at Heathrow but the English don't use the term "round trip." He would ask for a "return" booking. Possibly the dialogue wasn't accurate so as not to confuse American audiences, but that was likely not a big risk.
Cryder, the Lloyd's of London agent, mentions "English inheritance and English income taxes". Neither would apply. The recovery fee is not part of an estate, so inheritance is not an issue, and since Rockford is not a UK citizen or resident alien, only US income taxes might apply. However, in the US many types of insurance payouts are considered unearned income and therefore not subject to income taxation, and there are also exclusions for income earned from foreign sources by self-employed individuals for which Rockford may qualify, including exemptions for non-wage earnings.
Camilla Sparv, William Daniels, and at least one other character omit the first "r" when saying "cormorant," making it sound like a completely different word from an undefined foreign language.