Can you figure out this week's Secret Themes?

Each group of 10 otherwise unrelated questions has a theme running through their answers. Can you answer the questions and figure out the theme? Answers will be posted in a few days.

Ray's:

People claimed that this round and its theme were unreasonably difficult, which as we all know should be reserved for the sixth round. What do you think? Seven of the answers fit the theme in a linear fashion and three require a bit more effort.

1) What's the largest city in the Spanish administrative region of Castille & Leon?
2) In what 2003 comedy movie did Christopher Walken play mob boss Salvatore Maggio?
3) In what 2004 big-budget film did Viggo Mortensen play Frank Hopkins? Hint: Hopkins was a real man, but the events that the film are based upon were probably things that he made up out of whole cloth.
4) What specific common brand name product is associated with Avery Island, Louisiana?
5) Which US state derives its name from a fictional land described in the 1510 book The Exploits of Esplandian?
6) What well-reviewed 1992 film, based upon a best-selling novel from a few years earlier, starred Marco Leonardi and Lumi Cavazos as a couple?
7) What was the 1981 film known in Australia as Mad Max 2 released as in the United States?
8) What North American desert is also called the Gila Desert?
9) What's been Dodge's SUV model since 1998?
10) What breed of dog is Sharon Osbourne's pooch Mimi?

... and what theme links the 10 answers?

Frank's:

1) What major boxing bout, known by a catchy moniker, took place October 1, 1975?
2) If you're playing Monopoly and holding a yellow card, what sort of card are you holding?
3) What Prussian, and later German, military decoration was awarded 1813-1945?
4) What's the oldest university in the English-speaking world?
5) The Battle of Palmito Hill was the last battle of the American Civil War (May 12-13, 1865, after Lee's surrender). In which state did it occur?
6) What Mark DeCarlo-hosted syndicated dating game show ran nationally 1991-93?
7) Of the 5 D-Day landing beaches at Normandy, only two had codenames which were names of places. Which two?
8) What Australian sporting goods and activewear company, founded in 1973, is named after the Aussie English word for a stagnant pool of water?
9) What major US city gained the nickname "Hog Butcher to the World" owing to the opening line of a 1916 poem written about it?
10) What 2000 crime movie featured Dennis Hopper and Ice-T?

... and what theme links the 10 answers?