Continuity mistake: The Christmas decorations in the outside of the house change as to where they are and what they are.
Continuity mistake: In the wedding reception dance scene, you see a couple dancing amongst the guests on the dance floor. The female is wearing a seafoam green dress with a large matching bow in her hair. About 2/3 of the way through the song "On the Bayou," you see this same couple run onto the dance floor from off camera to watch the featured dance couple, as if they had never been on the dance floor at all.
Continuity mistake: Janice van Meter's dress at beginning of the reception is floral with a flowing bottom. Then when when dancing with Trudy's son and looks like "2 pigs fighting" its tight and cream.
Continuity mistake: When M'Lynn and Truvy are sitting in the backyard drinking tea after the funeral, there is no greenery next to where Truvy is sitting. In the next shot, when Clairee and Ouiser walk in the backyard together next to Truvy, there are now bushes and some trees that weren't present in the shot beforehand.
Continuity mistake: In the scene after Shelby's funeral has taken Place where M'Lynn, Truvy and baby Jackson are in the backyard, Annelle is bringing the two ladies some tea. In the next shot, Ouiser and Clairee walk into the backyard and now present in the shot next to Truvy is a small tree and shrubbery that was not there before.