At 3:45, I really found it very difficult to understand her accent. The youtube transcript shows the very out-of-world things.
Should I practice with BBC documentaries for both Aussie and American accents?
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The host, Craig Ferguson, is Scottish. Now, he has an accent too. I presume it is a Scottish one, but it's very mild/toned down because I find it easy to understand what he is saying. I'm sure it would be incomprehensible otherwise.
The guest, Yvonne Strahovski, said "I even tried yours once", referring to Craig's Scottish accent. Craig then gets her to try a Scottish accent. It is neither American nor Australian.
I have very little experience listening to Scottish accents, so I find it difficult to understand the accent. I'm not the only one. But I think this is what she says using that accent:
After the noon ladies. That's how I talk in a Scottish accent. It's a little bit like that.
Judging from Craig's reaction, it was horrible.
Regardless of the accent, if you want to get good at listening and understanding a variety of accents, you should try to consume as much media as possible that have that particular accent. If possible get things like movies that have professionally done subtitles. The subtitles found on Youtube are usually unreliable.