Alex is meeting Gigi for drinks, when he is supposed to be introducing her to Bill. When the waitress brings his drink the glass is nearly full, but when he picks it up to take a first drink, the glass is only half full.
When Ben is teaching Janine the properties of wooden and engineered wood flooring, he's holding a dark brown wood in his left hand and a golden brown panel in his right. In the next shot, he holds up the golden wood in his left hand. In a moment, the panels have switched hands.
When Mary checks her messages, she dials 14103977 but not the entire phone number as shown on the phone screen. Afterwards, the number 14109771308*5585#3 is on the screen showing that she entered her password and started to listen to the messages.
When Ginnifer Goodwin and Justin Long are standing in Ginni's doorway, Justin Long is standing in the hall as they speak. One shot she is standing in the doorway, the next shot she is out in the hall as well, next shot she is in the doorway again and so on until the scene is over.
In the scene where Anna meets Ben at his office, the scene starts with daylight coming in through the office windows. At the end of the conversation, only darkness can be scene through the windows.
The yellow part in crab are actually its roe, not its hepatopancreas.
At the supermarket opener where Ben and Anna meet, she swipes her bank card to pay for her grocery items before the cashier rings up and gives her their total. However, while most people wait til the total shows, you can actually swipe at any time during the transaction, so this is not necessarily a mistake.
Beth's cousin says it's too bad that cousins cannot marry. In the state of Maryland, where this is set, first cousins can get married.
In Gigi's yoga class, the instructor tells them to go into "upward facing dog", but they go into "cobra".