Alan Bleasdale's emotive series "Boys from the black stuff" (1982) follows the unfortunate Jimmy (Yosser) Hughes as his life spirals downwards after he loses his job, working with a tarmac gang in Liverpool, to losing his wife and falling foul of the local authorities. Towards the end of the series Yosser, driven to despair, is seen begging for work with ...
The exclamation "Rather!", said with the accent on the second syllable, signifying enthusiastic agreement, is severely dated. It was briefly popular in the 1920s among the British (and, among them, mainly English) upper classes. It would be considered very old fashioned by many modern British speakers, and will be found mainly in the Wooster and Jeeves ...
For many people there's is an invariable form, irresepective of whether it is introducing a singular or plural noun phrase.
There is is less common in this context, but you sometimes hear it.
It is non-standard, but quite common.
That seems to be a "knock, knock" joke, one of a large class. The one you've quoted doesn't seem very funny, but maybe you haven't quoted the entire conversation. As Michael Harvey said in his comment, "There is two" is uneducated usage.
"Being ignored" is idiomatic. "Getting ignored" is a little awkward but most people would understand it and may not even notice anything "off" about it.
As for frequency of use in BE, Google's NGrams has "being ignored" as roughly 300 times more common.
The first sentence could be phrased without a comma as
This is my sister Jane.
which is now phrased in a way similar to the second sentence. Here, it is the first comma which should go.
The distinguished scientist Mr. Stephen, of AKL University, will be addressing the crowd tomorrow.
It is precisely because Mr Stephen's university is non-essential, ...