In the episode featuring Ada Lovelace, Matt cops out of helping with Motherboard's Valentine card, claiming that "I'm not big on Valentine's Day. It's a girl thing.", to the girls' obvious irritation. However at the end of the episode, it turns out he's made a card with an actually quite sweet poem ("Roses are red, violets are blue. A guy couldn't have better friends than you.") for the girls.
And that diary entry? Jackie just didn't read far enough as the actual word was "meaningful"; Inez just ran out of room.
In the newest season's "For Real", Harry and Bianca reuniting note until now, their first meeting (season 2's "When Harry Met Bianca/When Bianca Met Harry") was their only segment together, although they both hosted the 2005 "Cyberchase: Know Your Dough" special while working at a farm is pretty sweet. It certainly helps that they look the same after all these years.