McCartney told Hosking that touring concerts had changed enormously since the pre-Beatles days as the Quarrymen, when he and John Lennon played through a shared amp.
"From when we started out it's a completely different thing. We started in a van."
In particular sound systems were now much more advanced than the baseball public address system the Beatles used at Shea Stadium in 1966.
"We couldn't get heard above the screaming girls."
Two videos posted to the official Paul McCartney Facebook page on Thursday night and Friday morning showed the 75-year-old rocker in front of a backdrop, thought to be at The Farm at Cape Kidnappers, in Hawke's Bay.
"I've finally got to New Zealand, it's been a little while. Wow, look at that, it's beautiful", he said.
People were full of speculation on social media about where he could be with some suggesting he was in Havelock North, Cape Kidnappers and Te Awanga.
He is believed to have arrived at Hawke's Bay Airport via private jet on Wednesday night following Monday's concert in Sydney.
A member of the plane's crew previously told Hawke's Bay Today at the airport that "he's left already" and wanted to know how Hawke's Bay Today knew about the arrival.
The plane landed after the normal daily schedule of flights had ended.
He was understood to be in the region for a break ahead of tonight's concert at Mt Smart Stadium in Auckland which wraps up his One on One Australia/New Zealand tour.
The "big party" gig will be about three-hours long, with works spanning McCartney's entire career - from his earliest work with The Quarrymen through to his most recent collaboration with Kanye West and Rihanna – as well as global treasures from The Beatles, Wings and his solo catalogue.
McCartney said to Hosking that he tried to select a song list that he would want to hear if he was a fan – and he acknowledged that the older fans wanted to hear Beatles material – but said younger fans knew his more recent work better.
"I do love it and I do it because it's great fun."
He agreed that continuing to perform live helped keep him young at the age of 75.
"I do it because I like it and I think there is that thing where you give up what you're used to doing you can [be] sitting by the telly all day and I don't fancy that," he said.
"People pay big money to come to a show so I feel obliged to give them a good time."
Where in the Bay is Paul?
"I can hear him at Black Barn rehearsing" - Thursday
"He is up on Marine Parade now." - Thursday
"Rumoured to be in Havelock North" - Friday
"He is in Havelock North" - Friday
"He's at Black Barn" - Friday
"His jet can be clearly seen driving past the airport ... it's impressive" - Friday
Where was the video shot?
"One of the Black Barn houses up the Peak road?"
"Can see that view from the redwoods"
"It's out at the Te Awanga golf course"
"... you can see Napier and Flat rock in the background."
