Genuine ones stick to exact measurements for authenticity. Beyond pure measurement, two quick non-dimensional checks help confirm what your ruler already told you
For a while, all existing dual-type cards had either Darkness or Metal as their secondary type, with the exception of certain Pokmon cards with the Dual Armor Pok-Body, such as Medicham from the EX Crystal Guardians expansion, which can have multiple types when certain energy are attached
Professional Service Is printing at home actually cheaper
Fossil Cards act as our counter to the opponent using the Sabrina Supporter Card, so we don't put a low HP Zapdos ex or our Raichu at risk
All cards with kicker state that if the card was kicked, then do this. There are a few cards like Roost of Drakes and Verazol, the Split Current that reference kicked cards
Then again, we do live in a world of AI videos that can fake almost anything