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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.
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Continuity mistake: The way Steve's mom's plastic bag is tied around her head changes between shots. Check the knot.
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Continuity mistake: When Steve arrives with his mom, he is either standing on the left of the cab's door or on the right.
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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.
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