The Apartment is located in the building above the bar, making it a convenient place for the gang to hang out. Although they can be seen at a variety of tables throughout the series, they are most often found at their favorite booth near the bar.
MacLaren's is known to have a full kitchen offering a variety of food as well as the usual bar fare.
Ted and Barney became temporary barmen in Three Days of Snow. In a flashback scene in the same episode, it is revealed that Ted and Barney have previously enthused at the prospect of owning a bar. When Carl has to leave, they try to get two college girls drunk so that they can sleep with them. This turns out badly for them when the band the girls are in the Arizona Tech Marching Band and invite the rest of their band to the bar.
In Tailgate, Ted and Barney are outraged with the price to get into MacLaren's on New Year's eve, so they offer for everyone to come upstairs. They then open their bar at The apartment, named Puzzles
In Moving Day, Barney laments that the MacLaren's pub is exactly a 23-minute cab ride from his own apartment, which is often a cause for his conquests to fail.
In Showdown, Future Ted states that there are 11 deep-fried appetizers on MacLaren's food menu. In the same episode, Lily orders all of them in an attempt to gain weight so that her wedding dress will fit.
A variety of MacLaren's-themed merchandise is available in the How I Met Your Mother store from CBS. 
MacLaren's is based on a bar in 240 West 55th Street, New York City called McGee's. 
The bar appears in the background of the set of Bones Season 5 Episode 3. (approximately 3 minutes and 43 seconds into the episode). It even includes the stairs leading up to The Apartment.
The same "street" (on the Fox Studios Lot) contains the Royal Diner, a frequent setting on Bones.
The gangs booth is always seen and thought to be near the middle of the bar and can be entered from either side however this is a slight continuity error as in Slutty Pumpkin the booth is shown from a different angle and it is actually joined onto the back wall of the bar, although it has been seen in later episodes to be in the middle, with another row of booths on the wall behind the camera
Throughout the seventh season (and possibly later seasons), the No Boogieboarding sign has remained infront of the bar.