Served cider, ice cream. Mirrors at the end of the bar made it look mile long

From Disney University Food Showmanship Disney Style 1973 :
Located next to the exit of the Country Bear Jamboree is the longest bar in the world. At least it appears this way at first glance. The Imagineers at WED produced this unique illusion by using a series of mirrors to produce an endless succession of reflections, thus, giving the guests the feeling of standing at a "Mile Long Bar."

From Steve Birnbaum brings you the best of Disneyland 1982:
If a hot dog will do, you can make a meal at this lace-curtained, paisley-wallpapered establishment alongside Teddi Barra's Swing- in' Arcade (in peak seasons, cold sandwiches are also available). But even if you prefer something more substantial elsewhere, be sure to stop in for a look at the polished wood bar, which almost looks as though it merits its name, thanks to an ingenious arrangement of mirrors. Hot pretzels, chips, dill pickles, brownies, ice cream snacks, frozen bananas, Hostess Twinkies, and soft drinks are all available, as is apple cider, which is served hot or cold. There are small tables set up inside and on the board sidewalk outside, alongside the waterfall at the exit to Country Bear Jamboree an altogether lovely, sweet-smelling, fern-decked corner of the park. Be sure to look at the three figures above the bar-Melvin the moose, Buff the buffalo, Max the stag, the Audio-Animatronics heads that preside over the Country Bear Jamboree next door. Serves Lunch, Dinner, Snacks.