Flashback--ONE TAKE
I was on the set, when they shot this movie. It is all one take -- no interruptions. Including the Flashback! The way they did it -- They pull in close on Scott Cohen's character for about a minute. Angela Bettis quickly changes off-screen. Meantime, the production design crew quickly changes the set in the next room. The same device is used on the way out of the flashback -- close on Scott Cohen, while Angela Bettis re-changes to present time, and the set is quickly restored to its original form.
The Black-and-White look of the flashback was added in post-production by de-saturating the colors.
All in all -- great movie!