Ditch the carpentry string and replace it with some paracord and something like 8-pound test firewire fishing line (something thin but still tensile-strong that can be used for sutures). Carpet/upholstery thread is too thick and coarse to sow up a smaller wound (provided we're talking about the same thing). And as for fishing, there are more effective ways to catch fish to survive than fishing - you'd be better suited using the fishing twine to make a small basket trap for the fish than to for fishing itself. (For the same reason, ditch the sinkers.)
Your sowing needle should have a small eye so it won't rip flesh.
Replace the calling card with 10 $1s and 2 5s. If things are so bad that you can't find somewhere to make change for a buck (and in the case of an emergency, change is more likely to work than a calling card), you're pretty much screwed. And add another $50 in $10 bills - what's $20 going to buy these days?
If youre in a colder area (or where it can get cold), a fleece hat and/or a large scarf or other head covering is important, especially for night. Body heat drops drastically at night, and nights are colder than the day; most deaths by temperature exposure, supposedly, happen when the poor b*start tries to catch some rest.
A pair of wool (or wool/poly) socks! I don't know how many times I've been somewhere and had cold, wet feet and have wished that I've had a pair. At any rate, changing socks every day seems to be one of the best ways to stay reasonably comfortable (even if they've been cycled through a couple times), and it's necessary in inclement weather. Having cracking sores on your feet that are uncomfortable in a bad situation makes that bad situation life-threatening - infection can easily set in.
Add a small bottle of alcohol, something like vodka - in a container like a hotel shampoo bottle. It'll burn, can be used as food, and makes a good antiseptic.
If you have allergies to
anything add some benadryl or similar. Bee sting? That'll help.
A small field guide. I take it you know what you're looking at, but in a stressful situation anyone can forget important details like (oh) don't eat the black mushrooms. Even if it's just something compact you've printed out on the computer you thought would be good to remember and put in a ziplock...
Ditch the mini-Bic and get a bigger, normal sized one, or get a second one. As a smoker, let me tell you that the 'normal' sized lighters are a -bit- more durable and last a lot longer; the small ones seem to wear out before they're out of gas.
Can't rememer whcih it is, but either ibuprophen or asprin is a blood thinner, and not something you'd want to take if you're actually hurt - or in a situation where an injury might kill you. Something to consider.
Work gloves are a damn good idea. If you've got office hands (I do), you'd be surprised at how quickly they get cut up doing "real work", or even being outside doing rugged things. I'd strongly suggest getting a pair of soft deer-hide or buffalo gloves - they're soft, supple, thin, but still pretty durable (I've had a pair I've used for 10 years and for yard work, gardening, show shoveling, etc. and while they're worn and stretched they still work.
Superglue! I have a friend who potentially saved his life with the stuff when he was 14; he'd been jabbed with knife making a lacerating wound and he used superglu to seal it up. The scar is about 3"-4" long and a quarter inch wide, and the glue did it's job of keeping things safe and clean.
Road flares! You have no idea how.. just kidding.