Before Fry and Leela are mugged, the Pi-KEA trailer is just behind them. But in the next shots when they are mugged, suddenly it has dissapeared behind them.
The miracle cream is said to work "on humans". However, Leela isn't technically a human. She is a mutant, which are deformed humans. Evidently she is human enough to allow the cream to work on her though.
In a flashback in "Leela's Homeworld" it is said that Leela is the "least mutated mutant in known history", so it would make sense for the cream to work as she is mostly human.
On the πkea box is an ø. However, this character is not used in the Swedish alphabet. It is only used commonly in the Danish, Faroese and Norwegian alphabet. More correct would have been an ö. However, the same 'mistake' is made in the subtitles for the opening credits of Monty Python and the Holy Grail. As such, it may be an allusion rather than a goof.
When announcing on the Planet Express tower about the new super heroes Leela's gloves are visible. But when she whispers "A new era of justice has begun" her gloves have disappeared.