Prop master Russell Bobbitt had difficulty finding the cassette decks used in the first film, and all of the Sony Walkman headphones they found were broken. Bobbitt contacted Sony to see if they had any available for filming. They did not, so he eventually created six from scratch.

People exposed to the vacuum of space do not freeze in a matter of seconds/minutes. In a vacuum the only way to lose (or gain) body heat is through thermal radiation. It would take hours and hours. This is what makes a vacuum a good insulator. In fact, if you were to float in sunlight you'd sooner cook than freeze.

Correction: The pressure is important: Your eyes, if left open, would basically boil and surface freeze because of lack of pressure on the liquid. Your tongue would be susceptible as well. The pressure issue would also make it impossible to hold air in your lungs, so you would pass out within a minute, but likely much sooner: "In 1965, while performing tests at the Johnson Space Center, a subject was accidentally exposed to a near vacuum (less than 1 psi) when his space suit leaked while in a vacuum chamber.

He did not pass out for about 14 seconds, by which time unoxygenated blood had reached his brain. Technicians began to repressurize the chamber within 15 seconds and he regained consciousness at around the equivalent of 15,000 feet of altitude. He later said that his last conscious memory was of the water on his tongue beginning to boil. So, there's at least one data point about what it's like to be in a vacuum. It won't be pleasant, but it won't be like the movies, either."

Cosmo the dog, Howard the Duck and the Grandmaster (a cosmic being from Thor: Ragnarok (2017)) are seen in the credits

Edited into Nostalgia Critic: Mary Poppins Returns (2019)