Yeah I thought that was weird too about Sirius! He somehow morphed into a different kind of dog in the time between those two movies! My guess is they didn't want to have to use CGI to create the dog like they did in the 3rd movie, so they decided to just find some big black dog for the 5th movie instead.
Everybody Wants to Rule the World  is a song by the English band Tears for Fears. Originally released in the UK on 22 March 1985 it was the band's ninth single release in the United Kingdom (the third from their second LP: Songs from the Big Chair) and seventh UK Top 30 chart hit, peaking at number two in April 1985.
April 22, 1970. We only have one earth, so we need to take care of her. That's what Senator Gaylord Nelson of Wisconsin believed. He was disturbed that an issue as important as our environment was not addressed in politics or by the media, so he created the first Earth Day, on April 22, 1970. An estimated 20 million people nationwide attended festivities that day.