Old thread, but I'll bite.
Every soda fountain in dime stores, Ice cream shops/DQ, or restaurants essentially made the same chocolate/vanilla/strawberry base with the nuts in syrup,crushed pinapple, and crushed strawberry with chocolate sauce pumped from container, whipped cream and cherry(ies). The toppings varied in placement, but pretty much the same. The container was originally either stainless or some metal or glass, but by the end of the 60's, most went to a disposable plastic.
There were a few exceptions that deviated from the original I remembered. Carvel made the "banana barge". I don't know if it's still made, but it used soft serve ice cream and the bananas were broken into quarters. They messed with they toppings and served it in a clear plastic diposable container. One thing that got a lot of folks was it cost a lot more then a typical banana split and the use of soft to serve cut cost.
The mother of all banana splits was something called a "Pig Trough" made by Marriot's Farrells parlors. This was huge enough for a few people. If one person actually finished one themselves, they would come out with a huge drum and bunch of servers and award you a pin/ribbon. I remember working on one with 3 other kids when I was in high school and we didn't finish it.
Moving into the 70's, a lot of places started to go to a huge goblet type container filled with ice cream, single topping like chocolate and whipped cream with slices of banana stuck in the sides and a cherry on top with maybe dry nuts on the cream. These varied a bit, not quite a sundae. Even IHOP got into the act on this one. IIRC, Sambo's before the Denny's takeover also made these.