Random things that I've noticed (because I'm obsessed and I notice the strangest things):

• Mwu isn't in any of the Gundam SEED endings (and neither is his rival, Rau le Creuset)
  
  
• Ironically, Mwu (in his SEED uniform and appearance) does appear twice in Destiny's 3rd Ending: "I Wanna Go to a Place"
  
  
• Murrue was the first person to pilot the Strike Gundam, and Mwu was the last person to pilot it
  
  
• Murrue is the only person seen in SEED and Destiny whose EA uniform has red shoulder stripes
  
  
• Both Mwu and Murrue's uniforms in SEED are that of a Lieutenant, even though they were both promoted in phase 15 to Lieutenant Commander
  
  
• Murrue is seen wearing Mwu's wrist band in Destiny (see Murrue's profile for details and image)
  
  
• Mwu is the only main character in SEED who has never been seen wearing civilian clothes (except in a brief flashback of his childhood, which since it's a flashback, doesn't really count)
  
  
• Mwu's name can be spelled many ways: "Mwu La Fllaga", "Mu La Flaga", but I prefer "Mwu La Flaga"
  
  
• Mwu is the only pilot from the Triple Ship Alliance who is over 18
  
  
• Mwu and Murrue shared the most kisses in SEED and Destiny (that was shown) out of all the canon couples: 4; Kira and Fllay: twice, Athrun and Cagalli: twice (once in SEED and once in Destiny), Athrun and Lacus: once (on the cheek), Kira and Lacus: twice (both on the cheek though)
  
  
• Out of the three main battleships in SEED and Destiny (Archangel, Dominion, and Minerva), Murrue is the only captain to have survived. Both the Dominion and the Minerva were destroyed by the Archangel, and their captains (Natarle and Talia) had been or could have been Murrue's friends. Both captains asked Murrue to surrender, which she politely refused. The Archangel was almost destroyed by the other two ships, but thanks to Mwu in both cases, the Archangel survived.
  
  
• Despite the fact that Murrue was captain of the Archangel throughout most of SEED and Destiny, she wasn't the first person to sit in the captain's chair, it was Natarle who launched the Archangel for the first time.
  
  
• Murrue's title of Captain Ramius ("Ramius-Kanchou") refers to her position as the person in charge of the battleship, not to her military rank of Lieutenant Commander ("Ramius-Shousa")
  
  
• Mwu seems to have a penchant of getting hand-me-downs, as his last unit in both series had been handed down to him by Kira (Strike) and Cagalli (Akatsuki)
  
  
• Except for one time (when the 8th fleet went down), the only reason Murrue ever cries in SEED and Destiny is because of Mwu.
  
  
• Nobody can explain logically how Mwu could've survived, because he has that scar on his face, which suggests that his helmet was broken, which means he couldn't breath.
  
  
• Mwu's helmet has two white feather insignias, referring to his nickname as the Hawk of Endymion.
  
  
• Mwu's broken, bloody helmet from the scene in Phase 49 was taken out in the special edition of SEED, paving the way for his return in Destiny.
  
  
• Mwu likes to wear his uniform with the sleeves rolled up and the collars open. Later, Neo wears his uniform the same way.
  
  
• Murrue got a promotion to Captain/Colonel ("Taisa") in Phase 45 of Destiny, when she became an official member of the Orb military.