Glen McKenna is not a real Scotch distillery, but is a fictional brand that was first used as a high quality Scotch in How I Met Your Mother.
The episode won an Emmy Award for Outstanding Multi-Camera Picture Editing for a Comedy Series.
While in this episode Robin, Becky and the Captain made an appearance, obviously aged a bit, considering it takes place around 15 years in the future, Carl the bartender is almost the same and seems he didn't aged at all. This may be a nod to the theory Marshal had in the past: Carl is a vampire.
When Becky tells the Captain she wants "Boats! Boats! Boats!" She's using the phrase she used while doing TV Commercials as an early morning news host with Robin Scherbatsky in How I Met Your Mother.