1. You should remove the word "and" and insert a comma after "small" -- teddy bears were named after Theodore (Teddy) Roosevelt: http://members.tripod.com/~bigbee/history
2. All are grammatical. 2 and 2-1 mean the same. 2-3 and 2-4 mean basically the same, too.
3. Yes, they both mean the same. The word "got" is rather slangy; "was married" is better. Another way to say this is this: "He married Jane in 1992."
4. They are all grammatical, but I don't think 4-4 makes sense. More than one person cannot be two-in-one; the phrase works in 4 but not 4-4.
5. Yes, it's grammatical. In this sentence, the phrase "Slow and steady" seems to be a saying that, altogether, is serving as the subject.
6. The sentence is good. DVD = digital video disk, yes.
7. Both are OK, but the first one is used most.
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