The Big Slipper/Bert & Ernie's Slip & Slide

In 1985 Sesame Place expanded to add two water attractions: The Count's Fount and The Big Slipper.

 Image from eBay

The Count's Fount eventually was replaced by The Count's Splash Castle. The Big Slipper still remains at the park, but has been renamed.

2004 Park Map

Today the twisting flume ride is called Bert & Ernie's Slip & Slide.

2012 Park Map

Despite being named after Bert and Ernie, it is in the Elmo's World section of the park and features his image on the exterior.

Image from Google Street Views

It's a fun way to beat the heat and there are three water rides in a row here, giving kids three rides they can hop on and off without walking too far in between attractions.

Sesame Studio

Sesame Studio is the name of an theater that currently houses Elmo's World Live:

 Image from IGOUGO

When the park opened in 1980, Sesame Studio was a very different attraction. One of the popular features was the Ernie's bathtub photo op:

1985 Image from YouTube

Children could step into a bathtub with Ernie and his rubber duckie:

1988 Image from YouTube

The bathtub was located next to a large, indoor, replica of The Sesame Street Set. 

 1988 Image from YouTube

This replica was phased out after the introduction of the larger outdoor neighborhood in 1988:

2012 Image

The Sesame Street Set was located next to a small chroma key theater:

 1985 Image from YouTube

The Sesame Street Set featured Big Bird and Little Bird peeking out of the nest and Prairie Dawn, Grover and Count Von Count looking out the windows.

1985 Images from YouTube

Kids could also pose for pictures inside Oscar's trash can (which was actually a half trash can open in the back.)

 Image from ThirteenLove

There was also a second floor balcony (which included a walkway to the upstairs exit of the studio.)

1985 Images from YouTube 

The chroma key stage would show children how the special effects were done on their favorite TV shows.

1985 Images from YouTube

The studio was transformed in the 1990s to create the larger theater that currently shows Elmo's world. For a time, the larger theater existed alongside exhibits like a room of mirrors (called Teleidoscope Temple) and these play puppets:

1999 Image

I'm not sure what the space is used for today, but it seems like the current theater only occupies two thirds of the building.


2015 UPDATE:
When working on the Sesame Place book I found that some of the science elements were also located on the second floor of the Computer Gallery.

Episode 16 of The Purple Stuff Podcast features a story about Return of the Jedi special effects being shown in the blue screen theater,

Big Bird's Feet

Here is an odd thing I noticed when I was looking at some old videos of Sesame Place, the entrance to Big Bird Bridge once had feet:

Image from YouTube

In fact, if you look at this piece of concept art, he was designed with feet AND hands:

Image from YouTube 

The hands were never part of the entrance to Big Bird Bridge, but the feet were built and did exist (in the center, not off to the side like the concept art shows.)

Image from YouTube 

The feet were removed between 1985 and 1986. Most likely it was to create a better traffic flow in the area.