Or, instead of killing Roger off if he found out about Barnabas (because Mr. Edmonds wanted to leave the series), they could've just had him go bleeblableebla and pack him off to Wyndcliffe in the hopes that Mr. Edmonds would change his mind down the road. They could've even brought up his name every once in awhile, such as when Julia has to go back there to do some work, or when Elizabeth went to visit him with a bundt cake.
But, anyway, back to on-topic about Angie-Baby. I still think that after Barnabas gave her the pushing-daises in 1796, she was resurrected and would secretly return to Collinsport every few years or so to check on her handiwork (the 1840 storyline said she did). In 1968, she made her return visit only to discover Barnabas not only released but cured, so she stopped off at a hair salon in Bangor, got a new colored-and-permed do, and plotted how to get herself back into the Collins family so she could practice more mischief. Of course, being a super-powered witch, she didn't age. Rumor has it that Joan Rivers even consulted her.
Gerard