Original Commentary

Originally, Brisbane's first line was along the lines of "I can't believe there's a park within walking distance". But then Isabel pointed out that they walked to that same park last time Emily showed up, and it got rewritten - Terrence

Modern Commentary
The original punchline was "Let's not mention that while you're here". The second one is an improvement.

Favorite bit is the first panel, though. The implication that the only thing that would make Emily's picnic better is doing it without Emily. - Terrence