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."
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One story dominates Thursday's front pages with some newspapers printing emotive pleas to voters to keep the United Kingdom as one.
After a mild start temperatures should pick up, with the south of England seeing highs of 26C.
In Edinburgh tonight you can hear it and feel it. The buzz, the banter of the day and the thrilling sense something big is coming tomorrow.