It is part of the whole.
The dialogue as well. It speaks to a modern audience, so they give it modern references. Then there is the directors artistic peccadilloes, and copyright, don't forget copyright. Someone gets the royalties of the version that is played as clips/music on TV etc.

It irritates we who notice, it is disrespectful too, but we are a small audience.

They ignore continuity errors. It is hard to believe they didn't see them in the cutting room. But to re-shoot would be expensive, and a logistical nightmare.