In the bigger picture, none of this matters. Text books are full of inaccurate drawings that get repeated from copy to copy, either because the writers haven’t spotted the errors, or because the publishers don’t want to pay for a new figure (you’d be surprised at how common that is). As time goes on, those figures get replaced by better representations, or photographs. Haeckel’s embryos haven’t been used to justify recapitulation (the notion that vertebrates, in their development, go through the adult stages of the phylogenetic tree —- i.e., that a human is first a fish, then a reptile, then chicken, then a pig, etc.) for over 100 years. They’re used to illustrate the notion that we share developmental processes with other vertebrates. So, the drawings had some serious errors and they got replaced. End of story. But not to the creationists, who still insist on using Haeckel as a justification for dismissing all of developmental biology.