Last Forever: Part Two - S9-E24
Trivia: On their wedding day, Tracy shows up at McClaren's to meet up with Ted and the gang. While sitting at their usual table, Ted and Tracy kiss. Right when that happens, we quickly see Marshall hand Lily some money. This is a callback to a bet they made in season 7, when Lily bets Marshall that Ted and Robin don't end up together.
Suggested correction: Depending on the location settings on his laptop, they could be giving a false reading. My laptop shows I'm in Cardiff Wales while in fact I'm nowhere near.
Ssiscool ★
The show was actually filmed on a film set in Los Angeles which is probably why the laptop says Los Angeles as the current location. This most probably slipped past the editing crew.