I don't get why they did that to Dex. It seems like they spent a long time building him up as a character only to suddenly eliminate him. We learned that he had a rough childhood, joined the military, maybe had a need for attention and acceptence from a father-figure which spurred him to work for Sonny. Then he and Joss broke up over who he was becoming, so he left Sonny and hit the straight and narrow by joining the police academy. The scene when they were decorating Joss and Trina's Christmas tree provided a little more insight into his past trauma. It felt like they were going to develop him more as a character and then he was just gone. Makes no sense.
Ned tried to get the game on TV but discovered the cable was out, so everyone continued to watch it on their phones. Then Michael said he could stream the game from his phone to the TV. Tracy came in and insisted they turn the game off, so she grabbed Michael's phone. In an effort to turn off the game, she accidently brought up the nannycam video of Drew and Willow on the floor of the nursery. No one meant for it to happen, but Ned and Tracy were quite amused when it did!
I think Cyrus stabbed Dex and then gave him digitalis in the hospital, same as he did to Sam. Dex had earlier warned Cyrus that he was going to be watching him, so Cyrus wanted him out of the way. Just my theory.