Corrected entry: Billy Beane is wearing a wedding ring, but there is no indication in the movie that he is married.
Corrected entry: The phone handsets in every shot are Cisco 7940 which are VoIP handsets. This technology was not available in 2002.
Correction: This entry is incorrect. VoIP was actually introduced in 1995. In 1996 it became the new choice for commercial use of telephones. The Cisco 7940 was actually released in February of 2002. You can actually check the first update to the firmware which occurred in May 2002.
Corrected entry: Billy Beane says to his boss "we're being gutted, we're losing Giambi, Damon & Isringhausen. Done deal." In the very next scene Billy Beane is on the phone to Giambi's Agent and loses Giambi. The scenes are in the wrong order. (00:05:45 - 00:07:25)
Correction: Its not Giambi its Damon who's agent calls, he says John and says the offer he got is from Boston where Damon ends up signing Giambi ends up on the Yankees.
Corrected entry: When they show Billy Beane as a young prospect, then advancing in the Major Leagues, he's batting right handed (which is the true as he did bat right handed). When they show the photo of Billy when he was a kid, he's holding the bat like a lefty, suggesting he swings left handed.
Correction: He was a switch-hitter. Your entry lacks continuity.
Wrong. He batted right.
Correction: Surely the presence of a wedding ring is a clear indication that he IS married. Just because the movie doesn't touch upon his marriage doesn't mean that he can't BE married (the real-life Billy Beane is), it's just that the fact of his marriage has no bearing on the story being told.
Tailkinker ★
The movie actually indicates that he's divorced so him wearing a wedding ring in the movie is quite odd.
He was divorced (from the character played by Robin Wright) but had subsequently gotten remarried.