When Larry was admiring the secretary who had just left Darrin's office, Darrin was holding the layouts and Larry's arms were straight down his sides. In the next cut a few seconds later, Larry was already holding the layouts with bent elbows.
The Stephens and Tates decided to go out and celebrate because their mistaken identity problem had finally been resolved. They all left the office right away even though it had been previously mentioned that Larry had a four o'clock appointment that afternoon.