Chuck sliding down the outside of the elevator startles a wife and husband on their second honeymoon. In Chuck Versus the Seduction (2008), this couple's first honeymoon was disturbed by Chuck trying to climb onto their balcony. It is certainly the same actress in both episodes.
The Arabic tattoo which was written in Diwani font is a famous Quote from the Bible John 1:14 - "The Word was made flesh, and dwelt among us."
At 10:51, the canisters of "bomb-making chemicals", one of which Sarah picks up, are actually different grits of Lortone's tumbling charge, used in rock polishing.
Dominic Monaghan plays British rock star Tyler Martin. He played Charlie Pace, a similar character, on Lost (2004).
Butterman is played by former NFL star, Jerome Bettis. His nickname is "The Bus" because of his size. He played running back for the Pittsburgh Steelers and won a Super Bowl in 2006. Bettis was inducted into the NFL Hall of Fame in 2015.