Supongo que tu miArray son las imágenes
Aquí estás comentiendo un error
err1.src = miArray[i].src;
la imagen es miArray[i], el segundo src te sobra
err1.src = miArray[i];
Código HTML:
Ver original<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <script type="text/javascript"> //<![CDATA[
var miArray = ['https://googledrive.com/host/0B5cDQ-G3aVMQMkdaelNsdTZ6TDQ/isabelM/img/forrest-gump-250x350.jpg','https://googledrive.com/host/0B5cDQ-G3aVMQMkdaelNsdTZ6TDQ/isabelM/img/piratas-del-caribe-250x350.jpg','https://googledrive.com/host/0B5cDQ-G3aVMQMkdaelNsdTZ6TDQ/isabelM/img/lo-que-el-viento-250x350.jpg','https://googledrive.com/host/0B5cDQ-G3aVMQMkdaelNsdTZ6TDQ/isabelM/img/gladiador-250x350.jpg','https://googledrive.com/host/0B5cDQ-G3aVMQMkdaelNsdTZ6TDQ/isabelM/img/casablanca-250x350.jpg'];
var num_errores = 5;
window.onload = function(){
var contenedor = document.getElementById('muestras');
for (i=0; i<num_errores; i++){
var err1 = new Image();
err1.src = miArray[i];
// context.drawImage(err1, miArray[i].ubic_x + dif_img, miArray[i].ubic_y);
contenedor.appendChild(err1);
}
}
//]]>
Saludos