Continuity mistake: Up until this time, the baby Brady has been shown to be larger, with a very round face and red hair. But when they show the baby in the crib (04:22) this is a different baby. It's much younger, smaller, no round face, and has dark brown hair. And later, when Steve's mother shows Miranda the photo of Brady, (14:21) again it's a much smaller, younger baby with dark brown hair, and no round face. During the actual Baptism, when they show close-ups of Carrie holding Brady while Charlotte takes pictures; (26:20) the baby looks like yet another baby that is smaller and younger, but appears to have reddish hair. Looks like they used 3 different babies to represent Brady at this point. (00:04:20 - 00:26:20)
Continuity mistake: When Charlotte and Carrie are sitting at a table outside, there is a woman with a long brown leather coat walking by. Shortly afterwards the same woman with the long brown leather coat walks by again. (00:08:20)
Continuity mistake: Carrie enters the chapel with Miranda and says the godfather smells bad. Carrie places her arm around Miranda, but it disappears a shot later.
Revealing mistake: When the baby is about to be baptised, it is replaced by a blatant doll: The doll's arm is stretched out (as opposed to the real baby's arms, tucked in his robe), and the doll's hair is very obviously painted.
Continuity mistake: When Miranda greets Steve's mom, she holds the umbrella straight upwards, but from the opposite angle it's bent backwards covering Miranda's back.
Continuity mistake: When Miranda asks Steve if his mom is drunk, her umbrella swaps from lying on her left shoulder to lying on the opposite side.
Continuity mistake: The way Steve's mom's plastic bag is tied around her head changes between shots. Check the knot.
Continuity mistake: When Steve arrives with his mom, he is either standing on the left of the cab's door or on the right.
Continuity mistake: When Carrie is sitting with the publishers, the woman on the left puts down her glass twice.
Answer: I'm a long-time fan of the show, having re-watched it many times, and I definitely remember slightly different dialogue at the end of that episode than what's on my DVD. I'm afraid I have no idea why this change might have been made or any other info, but you're not insane.
Purple_Girl