When Doom threatens Aunt May, she is in her purple dress. The moment Frump teleports her home, she is wearing a white apron over her dress. But as she arrives home, the apron is gone again.
When Frump's carriage is shown from an angle looking down on it, it's wheels are missing.
When Frump takes away the Spider-Friends' powers, Iceman is no longer cold, according to Firestar, yet he remains in iced up form and does not revert to his human identity.