Valerie's hair changes from messy to neat as she hands over the 'Committee of the Five' labeled bottle to Henry.
When Norcross is talking to Valerie and the two soldiers, he is holding a book against the left side of his body with the left arm. However, in the next cut after the reverse shot, Norcross now is grabbing the book with his right hand and passes it to his left hand.
When they showed a copy of the Troy Times newspaper, the paper only showed Thursday Evening but no specific date. In an American newspaper, you have the day, month, and year centered in the folio line.
Burt's glass eye moves inconsistently. Sometimes it is static and independent of his other eye (as a glass eye should behave), but at other times it moves in synchrony with his other eye.
(at around 45 mins) Valerie's room is on the left side of the front door. Fifteen minutes later, her room is on the right side of the front door.
Mike Myers' character is captioned as being MI6. Although the British Secret Service Bureau was created in 1909, it was not known as MI6 until World War II.
The film takes place between 1918 and 1933; however, the song La Conga Blicoti performed by Josephine Baker and played as source music was released for Princesse Tam-Tam (1935).
At one point during the gala after Berendsen finishes singing, he goes off stage to speak with his wife and in-laws. In the background, the audience is looking at the band on stage and bopping their heads to the music. However, the instrumentation heard is different from the instruments shown earlier in the band. A Vibraphone solo is heard, but there was no Vibraphone or Vibraphone player on stage.
(at around 16 mins) When Ed Begley Jr. first appears, he is introduced as General Meekins; however, his insignia show him to be a Colonel.