Striker Beckett, who has been out of favour at the Galpharm Stadium, made his first start in five games after coming on for the injured Andy Booth.
But just ten minutes in, Beckett found himself doing the defensive duties more suited to Booth and he failed to clear the ball and allowed James Hayter to put the Cherries ahead.
Beckett, who struggled for service for much of the game, became the hero in the 69th minute when he kept his feet under a shirt-pulling challenge from Neil Young and drew keeper Gareth Stewart to slot home.
Just seconds before that it seemed the former Sheffield United striker was about to be substituted as manager Peter Jackson made a double change.
To the boos of the home crowd, Jackson opted to replace Beckett's hard-working strike partner Pawel Abbott along with Mark Hudson.
Jackson's faith in Beckett was rewarded inside a minute when he grabbed the leveller.
Hayter, who scored twice in a 2-2 draw at the Galpharm Stadium last season and turned down a deadline day move to Huddersfield, returned to haunt Jackson again when he capitalised on Beckett's blunder.
Gary Taylor-Fletcher made it eight for the campaign with the pick of the goals.
Hudson found Taylor-Fletcher deep in midfield and in no danger, but Bournemouth failed to halt his forward run and backed off. He exchanged passes with Abbott and broke into the box before firing a rising drive into the top corner.
Abbott had chances but his finish straight at Stewart was weak and then his header from Martin McIntosh's cross-field ball landed on the roof of the net.
The Cherries, without a win under caretaker management duo Stuart Murdoch and Joe Roach, were back in front three minutes after the restart when the Huddersfield defence cracked again.
Nathan Clarke and McIntosh failed to deal with a long ball and Leon Best nipped in to finish from close range.
Jackson's double substitution marked the return to action of injured midfielders Jon Worthington and Chris Brandon and both came through well.
Relieved at not being taken off, Beckett won his tussle with Young and kept his cool to equalise.
Bournemouth had two late chances to set up a victory ahead of the expected appointment of a new manager this week, but Hayter's header flashed wide and Shaun Cooper rolled his shot inches wide of the far post.