I have one more, this is a bit petty but overall just confuses me and it appears a other people too if some of the comments are representative.
When they were marketing the show they had a Facebook page where they added parts to the timeline to "fill in the gaps". Random bits of info that may or may not have made sense to the continuity. Part of this was adding pictures. Backdating to the original show they have screencaps from episodes but any time they have the young John Ross or Christopher instead of it being a picture of the original actors playing the characters as you'd expect to see them (Tyler Banks (toddler John Ross), Omri Katz (child and teenage John Ross), Eric Farlow (toddler Christopher), Joshua Harris (child Christopher) or Chris Demetral (teenage Christopher)) it was a picture of Josh Henderson or Jesse Metcalfe as children. It was just an odd choice to make. Like sure, these guys are now the adult versions of the characters, but pictures of them as kids doesn't register in an original viewer's mind as being the younger version of that character.
Examples below taken from the official page
https://www.facebook.com/pg/Dallas/