Don't make the rookie mistake of taking off too fast
Don't ever assume the people in front of you know where they are going, even if it is 50 teams
Towing people while walking or biking shouldn't be an optional exercise
It is never too early to tow or redistribute pack loads; don't let egos get in the way
The main navigator should be doing his/her thing and the 2nd should be closely watching everything
Everyone should be constantly aware of direction of travel, elevation gain/loss, mileage covered and pace
If possible, never stop and stand in the sun, always look for a shady spot
Try not to stop every 15 mins
If the team stops for some reason, take care of something you need to do now as opposed to stopping 5 mins later to get at some food (consolidate your stops)
Take care of foot problems immediately before they flare up into something nasty
When on foot, be careful not to fall into "Sunday stroll" pace - you're in a race so move with haste; many teams jog flats and downhills
If there are opportunities to do a pace line on a bike leg, do one
Drink and eat often - try to drink every 15 mins and eat in little bits; you should have 12 hours of food available w/o ever needing to go into your pack - there are many on-chest systems (see equipment list) that will give you extra handy storage space; when the group stops, eat and drink
Having said the above, try not to bring too much food - you can only go a couple of days w/o water but a few weeks w/o food; you're in a race, not an eating contest
Never ever pass up a water source because you don't feel like filling up b/c you may not find water when you need it later
When traveling at night try to use as little light as possible - you can have 1 or 2 headlamps on vs. all being on or you can use your low beams when biking uphill or no lights when pushing the bike
Always turn off all your lights when you stop
In races 2 days or longer, take your shoes and socks off and raise your feet when you stop to dry them out and stem off swelling