The Pink Panther has four fingers on each hand, but when it counts to ten to open a parachute, five fingers appear on each hand.
The final gag (the fast-walking persecution with PInk Panther and a group from military police) is used again in Prefabricated Pink (with workers from a construction instead of military police).
At the time of this short, the space age was in full swing and supersonic jet aircraft were all over the news. Everything was named after jets or supersonics, from toys to cocktails. Although this cartoon seemed fanciful for the time, where Pinky heads to the very edge of space, in the 21st century, such journeys would take place in entrepreneurial spacecraft. Life does imitate art, after all, as Oscar Wilde said.
There really was an experimental aircraft assigned the designator 'X-13' (the 'X' has always been used to designate experimental aircraft). The X-13 was an experimental VTOL (Vertical Take-Off and Landing) jet built by Ryan Aeronautical.
One of the many prescient fixtures in the experimental jet's cockpit is what would become digital screens.