While Donovan's "Hurdy Gurdy Man" is playing in the front yard a shot of the phonograph shows an LP with the Atlantic Records label. Atlantic has never released a Donovan album or compilation.
(At 8:00) Frank presses the home button on his iPhone to answer a call. The sound heard when he presses the button is the sound normally heard when locking an iPhone.
When the thief is trying to siphon gas out of the truck and catches himself on fire he is fully engulfed in flames for several seconds before the fire is put out yet he walks away just fine and his clothing isn't even singed.
The movie is set in September (as evidenced by the epilogue being on Thanksgiving "two months later"), but a large snowfall takes place during the course of the week, meaning it was filmed in winter.
At the beginning of Day 1, there is a montage while Frank and Nancy drive home. The shots include street signs at famous corners in New York City. One shot is of an abandoned Blockbuster Video store, but the sign for inquiries to let the space has a British telephone number, indicating this storefront is actually in England, not New York.
New York is shown to have a large snow storm, including in the neighborhood, yet the front yard and yard sale items have no snow or wetness to them.
Frank had his cell phone before and after the drug arrest at the gas station, where he asked the drug runner for payphone change. It is not explained why he didn't simply use his own cell phone.
Colin Quinn is credited as playing "Ryan the Bum #2", but in the movie he says that his name is Colin (aka Colin the Bum).