Sentence ending って used for emphasis/explanation or casual quotations?

Question

General Context Regarding Every Sentence: 蛍(mc of show) just moved from Tokyo, to a small town and she doesn't know anyone real well. All of this is from the show のんのんびより.

Sentence Context: Parts of the school hallway floor is rotten and one girl(なつみ) jokingly tells 蛍 not to get to close to the damaged areas or else she may fall through.
Then なつみ subsequently says to 蛍:

1. 冗談冗談。今まで床にはまったお間抜けさんなんていないって

To me, this one seems like I could interpret it as either:

• So far, there isn't an idiot that's fallen through the floor... (with emphasis/explanation added)

• It is said that, "so far there isn't an idiot that's fallen through the floor."

Previous dialogue leading up to the upcoming sentence in question:
（れんげ）こんなとこに鍵が落ちてるん
（蛍）それ私のだ
（なつみ）鍵なんの
（コマ）何何
（蛍）今日夜まで家に誰もいないから家の鍵持ってきてって

Sentence Context: 蛍 dropped her house key on the ground and someone asks her why she has a key in such a small town.
蛍 tries to explain by saying:

2. 今日夜まで家に誰もいないから家の鍵持ってきてって

This one I honestly have no clue what the って is doing here at all.
My guesses are:

• There won't be anyone at home till' tonight so I was told, "bring your key"
• There won't be anyone at home till' tonight so I brought my key. (seems out of place from my understanding though)

Sentence Context: In this scene 蛍 is walking through the small town, with a few other girls. Looking troubled and not saying much, one girl asks her "どうしたの？".
蛍 replies with:

3. 東京とはずいぶん違うなぁって

With this I'm thinking it could mean either:

• I was thinking, (this place) is really different from Tokyo.
• (This place) is really different from Tokyo. (emphasis/explanation added)

Any help regarding the understanding of って used in these sentences would be much appreciated. Thanks!

Answer 1

今まで床にはまったお間抜けさんなんていないって
There has been no idiot who got stuck into the floor, you know.

This って is originally a quotative marker, but here it's (almost certainly) working like "you know", or "come on". By "with emphasis added", do you mean this effect? The other interpretation ("it is said that") is highly unlikely because she is clearly thinking 床にはまる is like a joke.

今日夜まで家に誰もいないから家の鍵持ってきてって
{I was told / (My parent) told me} to bring the key (here) since no one will be home until tonight.

This って is a rather simple quotation marker, and everything before って is a quote. Someone (her parent?) told her the part before って. って for emphasis can be used with a request/command, but "Hey, bring (now)!" doesn't make sense here.

東京とはずいぶん違うなぁって
I was thinking "(oh, this place) is really different from Tokyo".

This って is a simple quotation marker, too. なぁ is an exclamatory sentence-end particle, so this って cannot be a plain emphasis like "come on".