The film examines the difficult period in Beckham's life after he was sent off at the 1998 World Cup.
"There will be a few tears in there from my mum I'm sure," Beckham said.
The former England captain said he valued the support of his teammates throughout tough moments of his career.
"It's the same for all of us six. There were good times, there were bad times, there were troubled times where we all stuck together," he said.
"But that is part of the movie, part of the history of the six of us.
"That is why it makes this such a great story."
More top news
Despite the sunshine in short supply in the places the next few days - it stays warm and a little humid and close in places.
The surfer was at a popular tourist beach in Costa Rica when the crocodile attacked and bit him several times in the leg and head.
After a mild and quiet night, the best of the sunshine will be across the south east.