Artistic License Economics: While numerous sources indicate that the WW2 bond drives were successful at meeting (and beating) their targets, Bud Gerber's speech paints a United States teetering on its last legs. Whether he was simply working off inaccurate information himself, or deliberately lying to the flag-raisers to put a burr under their saddles is not clear.
Gerber: You know what they're calling this bond drive? The Mighty Seventh. They might've called it the "We're Flat Fucking Broke And Can't Even Afford Bullets So We're Begging For Your Pennies" bond drive, but it didn't have quite the ring. They could've called it that, though, because the last four bond drives came up so short we just printed money instead.
Hilarious in Hindsight: Your viewing experience really will be undermined had you watched Season 5 of The Wire before this film as you recognise the guy interviewing the veterans.
Irony: the film focuses on the struggle to correctly identify the men who raised the second flag and appeared in the famous photograph. After the film's release, it was revealed through further research that 'Doc' Bradley also was not one of the flag raisers, even though he is one of the main characters of the film and presented as such. Additionally, Bradley's own son was the author of the non-fiction book that the film is based on.
Truth in Television: Possibly subverted in that more recent research has revealed that 'Doc' Bradley wasn't one of the flag raisers. Even the author of the book, Bradley's son, has accepted that while Bradley was there, he wasn't one of the six in the photo of the flag raising. All of which makes his silence after the war even more of a mystery - did he know? Or did he think it simply didn't matter?