It actually wasn't the same actress playing Reggie, it was an actress who played the little girl in My Girl. But the character was called Reggie Lass and Bryan confirmed on twitter afterwards that she was meant to be the same character

And that's interesting! Honestly I'm not sure how much influence Bryan had on DLM after the first few episods, he seems really annoyed about all of the ideas he couldn't carry out before he left (or was removed?) from the project