Watch the opening sequences of "M:I-2" and you'll see his first
  cousin, William Mapother, playing a villain's henchman and
  working a laptop in back of the plane. This is the biggest part
  Cousin Bill has had in a Cruise movie to date, and he also gets a
  "special consultant" credit.

In the final fight scene, Tom Cruise actually makes contact with
  with Dougray's jaw and issues him a hard punch.

Dougray has filmed in Syndey before "M:I-2".  He was there
  several weeks, back in 1995 while appearing in the 5th season of
  the British TV Drama, "Soldier Soldier" where he played Major Rory
  Taylor

Directors Trademark, John Woo: Doves
  
- source: IMDb

The title song being playing in he background during Tom's rock
   climbing scene is IKO IKO by the band Zap Mama. It's not on the
   soundtrack sold here in the States but it is on the European
   release of the soundtrack.  Tom must really love that song Iko
   Iko,because he also used it in Rain Man.
   - Thanks Patty for the intel!

The sunglasses that contain Tom's self-destructing mission are
   Oakley Romeos; when he tosses the exploding glasses over a
   cliff ("very good product shot," says one retail analyst), he's
   throwing away $275. He wears $70 Fives in the climactic
   motorcycle chase. Will M:I-2 make publicly traded Oakley's year?
   Analysts say yes. Sales of Ray-Ban Wayfarers soared post-Risky
   Business, as did Aviators after Top Gun. But Oakley might not
   reap all the profits: Times Square street vendors are hawking
   $10 Romeo knockoffs (2 for $15). The frame is plastic, not a
   special alloy of 20 metals, and the 'l' in Oakley wore off within 24
   hours. - Thanks Barbara for the report!

The motorcycles used in the chase scene are Triumph Speed
   Triples
, according to BenDavid's M:I-2 website.
   -
Thanks to Allman for asking!

The car driven by Tom Cruise in the chase scene, is a Porsche
   911 Carrera Cabriolet
.
   - Thanks to Andrew for asking!

  Dougray's computer/monitor are made by Swedish company
   MultiQ - www.multiq.com The actual model featured in M:I-2 is
   MultiQ's PC Monitor which incorporates a standard computer into
   the actual flat screen itself. Very stylish.

The BioCyte building Tom descends into is actually a real office
   building here in Sydney - The Governer Phillip Tower is hard to
   miss with its high tech looking card-stack roof. The lobby and
   entrance to the Governer Phillip Tower were also used in the
   movie.

Dougray's beautiful house was actually a real house built
   SPECIFICALLY for the movie. See The House that Hollywood
   Built
at exotics.com.
  - Thanks to Ashley from OZ for the above 3 bits of trivia!

Dougray was originally slated to play Wolverine in X-Men, but
   had to pull out when M:I2 shooting went overtime

Sean Ambrose's line about the perils of imitating Ethan Hunt
  ("grinning like an idiot every 15 minutes") is reminiscent of
  dialogue exchanged between Castor Troy & Sean Archer, who
  both disguised themselves as each other in Face/Off.
  - source: IMDb

John Woo's final cut of the film clocked in at 3 1/2 hours. The
  studio balked at this length and told him that the final length
  could not exceed 120 min. This could explain why there are so
  many plot holes and continuity errors in the theatrical cut.
  - source: IMDb

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