I'm having those same thoughts. There is still 2 1/2 hours before it shows here, so I'm going off your summary (thank you so much for doing that!).
There is one thing the ex-gf said that stood out to me, though - about Dylan not wanting to get up. Did she elaborate on that at all (i.e. didn't want to get up early in the mornings, didn't want to get up later, slept all day on the couch)? Was it because he didn't want to be there, was he bored, did he not want to do what was planned for the day? Those last few questions are just my musings, not really looking for an answer - just kinda stuck out to me after seeing that both ER and CR stated that Dylan didn't really like going to MR's. All MOO.
You're welcome! Look forward to hearing your thoughts after it airs there.
About not wanting to get up - I think it was "teenager sleep in" type not wanting to get up, and not liking getting up early in the morning. About the ex-gf, I found it odd that almost everything she said seemed like she'd picked up the key points of MR's main stories and made sure to corroborate them, but didn't say a lot beyond that. Could be editing or it could be what she was asked to do, I just found it odd. Here's specifically what she said:
K (ex-gf):
"I traveled to Mark's home, spent a week with him and Dylan. And um everything that he said is exactly what happened. Mark, uh, Dylan [I think she just accidentally switched names] slept on the couch, um, he would never get up, you know, he would walk around and he'd get up in the morning - Mark would - and smoke a cigaratte, and have a cup of coffee and he'd be like 'Dylan, dilly boy let's go, get up, get up.' We'd do this for like an hour, hour and a half, two hours, he just wouldn't get up.
And the same thing is like his work, he would have to go into town to do his payroll or drop off papers, because he travels, so that's why he's not home to be with his kids. I mean he travels, he works out of town, when he comes home he would get Dylan. But I don't believe for a minute that he killed his kid or... <interrupted by Dr. Phil>"