Continuity mistake: In the scene where Ouiser sits and lets out a belch, if you look in the mirror, you can catch her laughing.
Continuity mistake: When you see Shirley MacLaine laughing in the mirror after she belches at Truvy's, you can also see that her hat is back on her head, after she's taken it off and laid it on the chair.
Continuity mistake: At the wedding, Darryl Hanna's glass of coke is full when it's poured, but the level's lower when it's handed to her.
Continuity mistake: When Shelby gets out the bath and is talking to Jackson you can see her neck and face is wet, but in the next shot, as she turns around she's perfectly dry. (00:12:50)
Continuity mistake: When the boys put an ice cube down Mama's back, you can see the ice cube fall out of her shirt. She then still pretends there's ice down her back, asking Shelby to get it out. (00:03:52)
Continuity mistake: During the scene that Truvy is styling Shelby's hair for the wedding, we see Truvy start taking the rollers out of the left side of Shelby's hair. The camera then goes to another character and when it comes back Truvy is again taking the rollers out of the left side of Shelby's hair while the rollers on the right side are now out. (00:18:30)
Continuity mistake: In the scene where the women are putting the Easter eggs into the trunk, the first shot shows Annelle placing cartons into an almost full trunk. It is also shown that there are many more on the roof of the car. When Ouiser shows up, Annelle continues to place them in the trunk. There was no more possible room in the trunk to hold all of the cartons that were on the roof, and the ones that were there disappear.
Continuity mistake: In the wedding scene, when Drum Walks Shelby down the aisle, Clarie walks across the church doorway twice, once in the long shot, and again in Drum and Shelby's close-up.
Continuity mistake: In the scene at Shelby's reception when the whole crowd of guests are dancing to "On the Bayou," at one point everyone gathers around a particular couple who are burning up the dance floor. If you look at the crowd gathered as the shots change from different angles, Dolly Parton and Olympia Dukakis, among others, are in different places each time.
Continuity mistake: When walking by Truvy's beauty spot, Annelle has a tissue in her hand. In a wide shot she folds it up with both hands, but in the next closeup, it's unfolded in her left hand. (00:04:35)
Continuity mistake: When Julia Roberts has a diabetic attack in Truvy's shop, she is given a glass of orange juice, and she shakes so much that she spills about half the glass. But when Daryl Hannah grabs a towel and goes to clean it up, there's at least 2 glasses' worth of juice on the floor. (00:24:50)
Continuity mistake: In the scene at Truvy's before Shelby's wedding, Shirley MacLaine shows up with her dog, which she ties to the tree in a standard single knot (like that's going to hold a St. Bernard). When Drum shoots the firecrackers into the trees at the birds, you see the dog become agitated and break the leash, which is no longer tied, but secured around the tree by slipping the length of leash through the handle part.
Continuity mistake: In the scene where Julia Roberts' character is getting a manicure before her kidney transplant, she sets her arm up on the table. The camera cuts away and the next shot of her shows her putting her arm on the table, again.
Continuity mistake: When we see Truvy styling Shelby's hair for the wedding, her hair changes dramatically as the camera cuts between Shelby and the people she's conversing with.
Continuity mistake: In the scene when Shelby gets into the car after her wedding one of the balloons gets closed in the car door, so it's on the inside, but when camera returns to the car the balloon is on the outside.
Continuity mistake: After Shelby dies, her mother (Sally Field) goes to pick up Jack Jr. While he is running to her, in one scene he has a toy in his hand, the next he doesn't and when Sally Field picks him up, he has it again.
Continuity mistake: In the scene where the women are putting the eggs into the car and Ouiser walks over to Annelle and begins to converse with her, she is holding a carton of the eggs. The two front corners of the eggs keep changing colors as the shots keep changing from Ouiser and Annelle speaking.
Continuity mistake: In the last scene at the easter egg hunt Shirley Mclaine comes in with brown high heel shoes on. When she creeps up behind the tree to sit with Jack she has no shoes on and when she is running after the truck taking Darryl to the hospital she has tennis shoes and white ankle socks.
Continuity mistake: At Truvy's, during the diabetic attack. The juice glass that Sally Fields is trying to force down Shelby (Julia Roberts) changes levels during the different cuts, but nobody refills the glass. (00:24:45)
Continuity mistake: When Ouiser is trying to tie up her dog and hold it back, between shots her handbag repeatedly goes from hanging on her arm to laying on the floor. (00:15:20)
Answer: I believe it is because the child playing Jack Jr. was basically crying through this whole scene, as you can see. It's most likely his (actually her, as the real baby was a girl) real mother holding him to calm him down. Also, when the family is saying "Blow, blow," you can hear a female voice that is neither Julia Roberts or Sally Field.
When she is sitting with Jack Jr, it is before she goes to get her hair cut. When she tells M'Lynn she wants to cut her hair, she is wearing it in a banana clip and you can see the hair past her shoulders. When "she's" sitting with Jack Jr, there's no hair to be seen. Total stand in.
Daniel Camp is the actor who played Jack Jr.
Along with Daniel two other children played Jack Jr, C. Houser and Clara Gabrielle.