But Corden made sure the prince wasn't missing home by serving up tea and crumpets as they took in the sights, including David Schwimmer and Bruce Willis' homes, as well as "bringing class to the 405."
Although a tea trolley on a moving bus turned out to be not such a great idea.
The pair made a stop at the house used for The Fresh Prince of Bel-Air. Corden tested the prince's knowledge of the iconic rap theme tune before they dropped in on the rather shocked owner of the house for an impromptu royal visit and a visit to the bathroom.
Corden tried to convince the prince to move into the Fresh Prince mansion and even engaged the Duchess of Sussex over FaceTime to convince "Haz" to talk to the owners.
The Late Late Show host then spent some moments asking the prince personal questions, in particular when he knew that Meghan Markle was "the one."
"The second date, I was starting to think this was pretty special," said the prince. "It was just the fact that we hit it off with each other. And we were just so comfortable in each other's company."
He added: "Dating, with me, or with any member of the Royal Family I guess, is kinda flipped upside down. All the dates become dinners or watching the TV or chatting at home. And then eventually, once you become a couple, then you venture out to dinners, to the cinema and everything else. Everything was done back to front with us. So actually, we got to spend an enormous amount of time just the two of us rather than going to friends' houses or out for dinner where there were other distractions. There were no distractions and that was great, it was an amazing thing. We went from zero to 60 in the first two months."
Corden also asked Harry how he felt about Netflix's hit royal docudrama The Crown. The prince, who has a production deal with Netflix, said The Crown doesn't "pretend to be news, it's fictional. But it's loosely based on the truth."
"Of course, it's not strictly accurate," the prince added. "It gives you a rough idea about what that lifestyle [is like], what the pressures of putting duty and service above family and everything else are, and what can come from that."
Pivoting to the couple's long-running troubles with Britain's tabloid press, the prince said, "I am way more comfortable with The Crown than I am seeing the stories written about my family, my wife or myself. Because it's the difference between [The Crown being] obviously fiction, take that how you will, but [the newspaper stories] are being reported on as fact, because you are supposedly news. I have a real issue with that."
When Corden asked the prince who he'd like to portray him in The Crown, he picked redhead Damian Lewis.
The prince also explained his reasons for "stepping away, not stepping down" from the Royal Family. He spoke about how the British press was destroying his mental health. Describing the situation in Britain as "toxic," the prince said, "I did what any husband, any father would do, I needed to get my family out of there."
But he reiterated that he "never walked away" and "never will walk away" from the Royal Family and public service.
Elsewhere in the interview, the prince revealed that his son Archie's first word was "crocodile," that the Queen sent her grandson a waffle-maker for Christmas and that both she and Prince Philip are very familiar with how Zoom works.
Watch the full clip below.