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Murray, a two-time winner of the tournament in Miami, booked his place in the second round after coming from a set down to defeat Berrettini, who suffered dizzy spells, in a 4-6 6-3 6-4 success.
At times during the match Murray appeared to fake laughter when he lost points.
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Asked about that by Sky Sports Tennis' Laura Robson following his win, Murray replied: "You were saying I need to be happier on the court in the interview beforehand.
"So if I'm laughing, that's not ok. If I'm shouting, that's not ok. If I'm flat like I was in Australia, that's not ok. So it's very hard for me to get the balance right.
"I'm very different on the tennis court. I'm not a robot, I'm a bit odd, a bit strange, but I play better when I'm like that."
The former world No 1 also wrote on the court-side TV camera that there is "life in the old dog yet" after his win.
Henman: Murray 'spot on' with self-analysis!
Sky Sports Tennis' Tim Henman:
"He sums it up brilliantly.
"What a great question from Laura, too, because that is what we were trying to understand and interpret because it was always a pretty sarcastic laugh.
"But I think that's where Andy is. His own self-analysis and self-awareness is absolutely spot on."
Murray 'played a smart match when I needed to'
The 36-year-old, who will now play Argentina's Tomas Martin Etcheverry in round two on Friday live on Sky Sports Tennis, was satisfied with how he managed the match against Berrettini.
"I think in terms of the way I played and the important moments in that match, I did a good job," Murray said.
"I was down 0-40 near the end when it was 3-2, and I also created a lot of chances to go up a double break as well and hadn't got it, stayed tough there and played some good points.
"I moved well, and dictated a lot of the match, which isn't easy against him. Once I got the balance right against him, I felt like I dictated a lot of the points.
"I played a smart match when I needed to."
'Murray lifted his level between sets like you wouldn't believe'
"There certainly is life in the old dog," said Annabel Croft on Sky Sports Tennis.
"Who would have believed from the level he had at the end of the first set that he'd be able to bring the level up as he did?
"There were a couple of points he made extraordinary winners, and you feel he started to psychologically get into the head of Berrettini.
"By the end, Berrettini was physically and mentally beaten up by Murray, which is what Murray had done his whole career against opponents."
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